OS/2 Warp Frequently Asked Questions List

By Timothy F. Sipples

Introduction and Credits

OS/2 Warp Frequently Asked Questions List User's Edition (U.S. English) Release 3 February 20, 1995 Compiled by Timothy F. Sipples

Copyright (c) 1995 by Timothy F. Sipples All Rights Reserved.

For changes, suggestions, or additions please mail tsipple@vnet.ibm.com or write:

Timothy F. Sipples IBM Personal Software One IBM Plaza (07/SS4) Chicago, IL 60611 U.S.A. FAX (312) 245-7624

I cannot acknowledge your contribution(s) individually, but they are greatly appreciated.

Mention of a product does not constitute an endorsement. Customers outside the United States should not necessarily rely on 800 telephone numbers, page numbers, part numbers, or upgrade policies contained in this List. Electronic mail addresses are in Internet form; use addressing appropriate to your mail system. Certain product names, including OS/2, OS/2 Warp, and Windows, are trademarks and registered trademarks of their respective holders.

This List is freely distributable for noncommercial purposes. (For commercial purposes, please contact the author.) If you redistribute the List, please include all the original files. The views expressed in this document are not necessarily those of IBM Corp.

This List is updated regularly and is distributed through various computer networks and online services, including the Internet, CompuServe, GEnie, and many BBSes.

Both ASCII text and OS/2 Warp Information Presentation Facility (INF) versions of the List are provided. To view the INF version of the List, go to any OS/2 Warp command line prompt (e.g. double click on "OS/2 Window") and type:

VIEW WARPFAQ.INF

The ASCII text version may be viewed using any text editor, word processor, or file listing utility. The text version is intended to answer any questions you may have before actually obtaining and using OS/2 Warp. You will find that the INF version provides a much more attractive List, with hypertext links, fast indexing, and, increasingly, illustrations.

If you have not received all three files (WARPFAQ.ICO, WARPFAQ.INF, and WARPFAQ.TXT), please ask your system operator to make sure he/she is receiving the correct and complete package.

(0.1) Release Notes

Template:Text which has been revised or updated since the last release will ordinarily appear in the same color as this sentence and will be enclosed in double braces. However, due to the magnitude of the changes required for this release of the List, revision marking is not included.

BBS operators and archive maintainers: please retain Versions 2.1E, 2.0L, and 1.9G of this List, the last versions to deal specifically with OS/2 Versions 2.1x, 2.0x, and 1.3x, respectively.

(0.2) Recent Developments

OS/2 Warp Version 3 is here! Please see (0.4) Special Report on OS/2 Warp for the latest on this exciting new release.

To coincide with the release of OS/2 Warp Version 3, over 40 software developers have announced new software products. Here is a sampling:

   Product
       Description 
   Stacker Version 4 for OS/2
       On-the-fly disk compression 
   Artisoft LANtastic for OS/2
       Peer-to-peer networking 
   DeScribe Version 5 for OS/2
       Word processing/publishing 
   Athena Mesa for OS/2
       Object-oriented spreadsheet 
   AIM/SDS Galactic Civilizations for OS/2
       Action-strategy game 
   Hockware VisPro C/C++ for OS/2
       Rapid building of compiled C/C++ applications 
   IBM Antivirus for OS/2
       DOS/Windows virus detection and elimination 
   IBM OS/2 LAN Server 4
       State-of-the-art network operating system 
   Wolfram Mathematica for OS/2
       Equation solving, mathematical computation 
   Borland C++ Version 2 for OS/2
       C/C++ compiler, including OWL 
   Lotus Smartsuite ValuePak
       Enhancements to application suite 
   Dux SimCity for OS/2
       Urban planning game 

Other vendors expect to ship major new OS/2 Warp applications later this year, including Corel Office (including Corel Draw 6) from Corel Systems, Macromedia's Director (for multimedia presentations), games such as Doom and SimCity 2000, and even the first home "edutainment" CD-ROM title from CBS and IBM.

Independent estimates now put the OS/2 installed base at over eight million users. At the time of this writing, OS/2 Warp ranks as the top selling PC software in the marketplace.

The IBM Independent Vendor League offices have moved. For general information on the IVL, contact Lucy Darbisi at 203-452-7704 or by FAX at 203-268-1075. For product accreditation and support please call Gail Ostrow at 203-384-9996 or FAX 203-368-6379. The Independent Vendor League supports OS/2 Warp consultants, book authors, trainers, and other professionals.

(1.0) Fundamentals

The following questions are addressed in this section:

(1.1) What is OS/2 Warp?

OS/2 Warp is an advanced operating system for PCs with an 80386 processor or better. It was developed by IBM as the successor to DOS, the operating system developed for the original IBM PC.

OS/2 started as a joint project between IBM and Microsoft in the mid 1980s and was first released in late 1987 (at that time designed for the IBM PC/AT and other 80286-based systems). Microsoft was a public and vocal supporter of OS/2 for years, issuing several of its own releases and promoting OS/2 application development. Bill Gates, for example, stated that, "...OS/2 is the platform of the '90s." However, OS/2 versions from 1.3 onward have been the responsibility of IBM.

OS/2 Warp was designed from the ground up with preemptive multitasking and multithreading in mind. "Preemptive multitasking" means that the operating system is responsible for allocating processor time to the one or more applications which are running. (Cooperative multitasking, as found in Microsoft Windows or the Macintosh's System 7, requires that each application surrender the processor after a certain amount of time. If one application refuses to yield, all the other applications stop running.) "Multithreading" means that programs can start subtasks which will then be executed by the operating system in the background. For example, a word processor may create a separate thread (subtask) to handle printing or saving to disk. When the user asks the word processor to perform one of these tasks, the word processor creates a new thread and control returns to the word processor (and the user) immediately. The subtask is executed by the operating system in the background. The user is then free to ask the word processor to perform another task without waiting for the thread to complete. Applications which utilitize multithreading can be much more responsive to the user.

OS/2 Warp also protects applications from one another (a single misbehaved program will not typically disrupt the entire system), supports all addressable physical RAM, and supplies virtual memory to applications as requested, breaking DOS's 640K barrier.

An OS/2 Warp demonstration diskette (which will run on any PC with VGA or better, and DOS or OS/2) is available from IBM by calling 800-3-IBM-OS2. The OS/2 Warp demo diskette may also be downloaded; see (3.2) Shareware and Freeware Sources.

(1.2) Differences Between Versions

What are the differences between versions?

• IBM OS/2 Warp, Version 3 is the newest and most advanced version of OS/2 ever created. This release is aimed squarely at the rapidly growing home and small business software market. Yet, in addressing the concerns of these demanding consumers, it offers significant advantages to the large number of traditional IBM and OS/2 users, including those in big businesses and government. A few of the enhancements include a BonusPak of full fledged applications (including one button access to the Internet), the LaunchPad, many more device drivers, and significant performance improvements. Please see (0.4) Special Report on OS/2 Warp for more information.
• IBM OS/2 Version 2.1 is the previous release of OS/2, which added Windows 3.1 compatibility, multimedia support (including software motion video), and more device drivers. With Version 2.1 IBM ended the practice of including extra features in its own, preinstalled versions of OS/2 that were not found in the off-the-shelf package. OS/2 2.1x and OS/2 for Windows propelled OS/2 into the mainstream PC marketplace. The latest Service Pak for OS/2 2.1 is level 06300.
• IBM OS/2 Version 2.0 is the first release of OS/2 which will run only on machines with an 80386SX processor or better. With this release IBM started developing OS/2 (and its Intel and non-Intel-based successors) independently but continued to involve third party PC manufacturers in its testing. Improvements included an object-oriented Workplace Shell (WPS); a multiple operating system boot mechanism; better DOS and Windows support [see (1.3) DOS and Windows Compatibility]; new 32-bit programming interfaces; support for more than 16 MB of physical RAM [see (2.6) More Than 16 MB RAM]; and more third party device drivers. OS/2 1.x applications, unmodified, still run under OS/2 2.0 (and later).
• IBM OS/2 Version 1.3 is the last release of OS/2 to operate on PCs with 80286 CPUs. This version introduced built-in Adobe Type Manager (ATM) [see (5.5) Adobe Type Manager], providing scalable typefaces for screen and printer. Procedures Language/2 (REXX), a powerful batch-oriented programming language, became a part of Standard Edition with this release. [See (5.11) REXX.] (A few vendors are shipping Microsoft OS/2 Version 1.3, but Microsoft has ceded all OS/2 development to IBM.)
• OS/2 Version 1.2 was the first to incorporate the High Performance File System (HPFS) [see (1.5) High Performance File System]. With this release IBM OS/2 added a dual boot mechanism and IBM Extended Edition [see (3.10) Extended Services] introduced REXX.
• OS/2 Version 1.1 was the first to include the Presentation Manager (PM) GUI/API. Microsoft OEM versions added a dual boot mechanism with this release.
• OS/2 Version 1.0, introduced in late 1987, was the first release of OS/2. Task switching was accomplished using a character-based shell and limited DOS compatibility was provided.

Versions of OS/2 from 2.1 on have been made available in two packages: one containing built-in Windows code to run Windows applications (sometimes called the "with Win-OS/2" or "full" package) and the other which can use an existing copy of Windows (optional) to run Windows applications (the "for Windows" or "without Win-OS/2" package).

(1.3) DOS and Windows Compatibility

How good is OS/2 Warp's DOS and Windows compatibility?

OS/2 1.x [see (1.2) Differences Between Versions] justifiably earned a reputation for poor DOS compatibility. Since it was hampered by the 80286, it could not run more than one DOS application at a time.

The situation changed dramatically with OS/2 2.0, and OS/2 Warp adds further refinements. OS/2 Warp Version 3 preemptively multitasks DOS and Windows (standard and enhanced mode, including Win32s) applications in separate, protected sessions.

OS/2 Warp provides a complete DOS emulation equivalent to DOS 5.0 or later. The operating system can provide each DOS application with up to 32 MB of EMS 4.0 (expanded memory), 16 MB of XMS 2.0 (extended memory), and/or 512 MB of DPMI 0.95 (DOS Protected Mode Interface extended memory), all from its pool of physical and/or virtual memory (meaning you do not have to have as much RAM in your system as your applications request). These limits are in addition to the up to 730K free conventional memory supplied to each DOS application, even after mouse and network drivers [see (3.8) Networking Products] are loaded. As in DOS 5.0 or later, DOS code and device drivers may be loaded into high memory. A 386 memory manager like QEMM is not needed -- these features are provided by OS/2 Warp directly.

The DOS emulation allows customization of device driver sets -- each DOS application shares a systemwide CONFIG.SYS and the equivalent of its own CONFIG.SYS. Also, there is a systemwide AUTOEXEC.BAT file; however, batch commands particular to each DOS application can be invoked using separate, application-specific AUTOEXEC.BAT files. And many DOS Settings are provided to fine tune [see (5.6) Performance Tuning] each DOS/Windows application's behavior (e.g. IDLE_SENSITIVITY and SESSION_PRIORITY). Most of the popular DOS/Windows applications on your hard disk will be migrated automatically when you install OS/2 Warp, so that program icons will be set up for them. Applications which are automatically recognized include over 250 of the most popular DOS, Windows, and OS/2 games.

In addition, OS/2 Warp will boot one or more specific versions of DOS in separate sessions, to assist in running particularly difficult applications (e.g. DOS networks, MSCDEX and CD-ROM drivers). So, for example, it is possible to multitask DOS 3.3, DOS 4.0, DOS 5.0, DOS 6.0, DOS 6.2, PC-DOS 6.3, DR-DOS, OS/2 Warp's DOS, and Desqview running atop DOS, all in separate sessions, either windowed or full screen, all with the same and/or separate device drivers, TSRs, environment variables, etc. DOS boot images may be stored on a hard disk. These procedures are described in the online Command Reference (under VMDISK), Master Help Index, and in the printed manual. [See also (5.9) Specific DOS Sessions.]

Standard graphics modes [generally up to VGA resolutions; see (2.2) SuperVGA Support] are supported in DOS windows, as are selectable text mode fonts. Cut/paste to/from windowed DOS applications is supported (to/from other DOS, OS/2, and Windows applications), including graphics cut/paste. Theoretically, OS/2 Warp can run up to 240 simultaneous DOS/Windows sessions; the practical maximum depends on your PC's performance.

OS/2 Warp will, in fact, run virtually all DOS applications in existence, including notorious ones such as Microsoft Flight Simulator, Wing Commander, Maple, MatLab (Version 3.5k or later), AutoCAD (Release 12 requires maintenance version C2 or later), and others. Those that do not run generally fall into the following categories:

  1. Programs that use Virtual Control Program Interface (VCPI) memory extenders or other extenders which require direct access to 80386 control registers. Since such applications are also all but incompatible with Windows, most vendors have updates for DPMI compatibility;
  2. Applications which attempt to directly address the physical sectors of an OS/2 managed nonremoveable hard disk drive. Such programs include UnErase in Norton Utilities [see (3.4) Disk Utilities]. Fortunately OS/2 Warp has a built-in UnDelete feature which is more robust than Norton's approach. (Consult the online Command Reference for information on how to enable UNDELETE);
  3. Timing sensitive DOS applications. Certain DOS programs that generate digitized sound through the PC's internal speaker may have distorted sound. High speed, real time data collection may be compromised. These problems can often be minimized or even eliminated using OS/2 Warp's DOS Settings, including the SESSION_PRIORITY setting.
  4. Certain DOS programming debuggers. DOS applications running under OS/2 Warp are not permitted to access debug registers DR0-DR7 from a DOS session. Also, DOS debuggers will not be able to set hardware breakpoints, and all read/write operations to debug registers in virtual 8086 mode will be ignored. 

See (3.12) Backup Software for information on OS/2 backup issues.

DOS-based disk caching software is not required since OS/2 Warp includes a built-in, highly configurable, efficient disk cache (available even for CD-ROMs). See the online Command Reference for details.

DOS programs running under OS/2 Warp are extremely fast. A single DOS application (no other applications open) running full screen under OS/2 Warp typically achieves 95-97% of the performance it would have under native DOS. If the DOS application accesses the hard disk frequently, such as with database software, it can actually operate up to several times faster than it would if running under native DOS.

If pure DOS is absolutely required, OS/2 Warp includes a utility called the Boot Manager. The Boot Manager can provide a listing of all the operating systems available on the system and will allow selection of any one at startup, with a default after timeout. The OS/2 DualBoot method (to switch between DOS and OS/2 only) is still available as well. Consult the printed OS/2 Warp manual for instructions on how to use Boot Manager or DualBoot. Note that OS/2 Warp need not be installed on Drive C -- it can reside on other volumes [see (4.3) Hard Disk Partitioning].

Compatibility with Windows, a popular DOS extender, is provided by either Win-OS/2, an environment based on Microsoft's Windows source code, or by an actual copy of Windows 3.1, Windows 3.11, Windows for Workgroups 3.1, or Windows for Workgroups 3.11. See (1.2) Differences Between Versions for details. OS/2 Warp supports Windows 3.x enhanced mode (including Win32s) and standard mode applications, either on a full screen Windows desktop (with the familiar Program Manager and one or more Windows applications) or "seamlessly," alongside OS/2 applications on the Workplace Shell desktop. "Seamless" operation is available with all video drivers that ship with OS/2 Warp (VGA or better). [See (2.2) SuperVGA Support.]

Several icon conversion utilities can convert Windows icons for use by the OS/2 Icon Editor and/or OS/2-specific programs [see (3.2) Shareware and Freeware Sources]. (No conversion is necessary if the icons are to be used with Windows programs running under OS/2 Warp.)

OS/2 Warp directly provides all Windows enhanced mode features save one: support for Windows virtual drivers (VxD). Services provided by WINMEM32.DLL and Win32s are supported. See (0.4) Special Report on OS/2 Warp for more information.

Windows applications are well integrated into the overall OS/2 Workplace Shell environment with DDE and Clipboard hooks, and OLE (Object Linking and Embedding) is supported among Windows applications. Adobe Type Manager [see (5.5) Adobe Type Manager] comes with OS/2 Warp (for both OS/2 and Windows applications), and TrueType fonts still work fine with Windows applications. Windows screen (for a full screen desktop) and printer device drivers will work under Win-OS/2 [see (2.2) SuperVGA Support]. Such notorious Windows applications as Word, Norton Desktop (save portions described above), Toolbook, and After Dark work fine under Win-OS/2. Even applications which rely on the Windows Multimedia Extensions (supplied as part of Windows and Win-OS/2) operate without trouble. [See (3.6) Multimedia for information on the OS/2 multimedia extensions, MMPM/2.] Even the Windows applets run just fine.

OS/2 Warp's Windows support (called Win-OS/2) departs from plain Microsoft Windows in that it allows more than one Windows desktop and can preemptively (rather than cooperatively) multitask Windows applications in separate, robust, protected sessions, at the user's option. Also, both DOS and OS/2 applications can be started from the Win-OS/2 Program Manager.

In short, OS/2 Warp is generally regarded as the most DOS and Windows compatible among the new crop of 32-bit operating systems (NT included). It is also generally regarded as a better DOS multitasker than Desqview.

(1.4) Availability and Cost of OS/2 Warp

Where can I buy OS/2 Warp, and how much does it cost?

In the United States IBM OS/2 Warp Version 3 is available directly from IBM by calling 800-3-IBM-OS2. Call for the latest information on pricing -- promotional pricing may be in effect. Both diskette (3.5 inch media) and CD-ROM versions are available. The CD-ROM version contains diskette images (so you can create a set of installation diskettes from the CD-ROM) as well as extra multimedia and Kodak Photo CD files. Express shipping is provided with all orders placed through this toll free number.

IBM part numbers are as follows:

Part No.

   Product 

83G8100

   OS/2 Warp Version 3 (3.5) 

83G8102

   OS/2 Warp Version 3 (CD) 

83G8103

   OS/2 Warp Version 3 (ALC) 

83G8700

   OS/2 Warp with Win-OS/2 (3.5) 

83G8701

   OS/2 Warp with Win-OS/2 (CD) 

83G8702

   OS/2 Warp with Win-OS/2 (ALC) 

83G8708

   OS/2 Warp with Win-OS/2 Upgrade (3.5) 

83G8709

   OS/2 Warp with Win-OS/2 Upgrade (CD) 

83G8710

   OS/2 Warp with Win-OS/2 Upgrade (ALC) 

Upgrade packages are designed to upgrade OS/2 2.1 or 2.11. "ALC" means Additional License Certificate, in other words simply a license card (without manuals or media) representing the right to use OS/2 Warp on an additional PC.

OS/2 Warp is now available from almost any software dealer (including Corporate Software, Egghead, Software Etc., and many others). Software dealer pricing is lower than that available directly from IBM -- often $10 or $20 lower.

OS/2 Warp costs about the same as Microsoft Windows for DOS and roughly one fifth to one third as much as the base (not to mention server) versions of Windows NT, NeXTStep, Solaris, and UnixWare.

In Canada phone 800-465-1234 to order. In the U.K. phone the OS/2 Solution Centre at 0285-655888 or IBM at 0256-841818 or 0800-919-929. In all countries, any IBM software dealer or office can fulfill your OS/2 Warp order. Pricing varies from country to country.

IBM is trying to make OS/2 Warp available everywhere DOS is purchased. If your dealer does not stock OS/2 Warp, take your business elsewhere (and explain why). IBM bundles OS/2 Warp with most new PCs, and several other vendors, including AST, Compaq, Everex, Northgate, ALR, Unisys, Dell, Ariel Design, Vobis, Escom, Toshiba, Osbourne, and Tangent, will either preload OS/2 Warp automatically or by request.

IBM offers two money back guarantees in the U.S.: a 30-day, no questions asked, money back guarantee, and a 90-day compatibility guarantee [see (2.1) Hardware Requirements].

If you intend to purchase many copies (usually over 100) of any IBM software product (including OS/2 Warp), be sure to ask your software dealer or IBM representative about VALU agreements. Using VALU, you can save significant amounts of money on your software purchases and benefit from special promotions.

In many countries outside the United States, a fully functioning 45-day trial version of OS/2 Warp on CD-ROM is available through PC oriented magazines, computer shows, dealers, and other outlets.

(1.5) High Performance File System (HPFS)

Why should I use HPFS? What does it offer me? Does it work with DOS?

HPFS is an installable file system (IFS) provided with OS/2 Warp which may optionally be used instead of (or alongside) the standard DOS-style FAT (File Allocation Table) file system. HPFS offers long file names (up to 254 characters including the path, greatly exceeding the "8 dot 3" limit in DOS's FAT file system), contiguous storage of extended attributes (without the EA DATA. SF file used by FAT), resistance to file fragmentation, improved media error handling, smaller cluster size, support for larger file storage devices (up to 512 GB), and speedier disk operation, particularly on large hard disks, on systems with more than 6 MB of RAM. HPFS is not case sensitive, although it does preserve case in file names.

However, HPFS is not currently supported on removeable media, although some programs (e.g. BACKUP) preserve long file names on such FAT disks. Also, native DOS cannot access a HPFS partition without a special utility. However, DOS/Windows sessions running under OS/2 can use all files that conform to the "8 dot 3" naming conventions, even if they are stored on HPFS volumes. (FAT is not required for compatibility with DOS and Windows applications running under OS/2 Warp.)

Note that PowerQuest has released Partition Magic, a utility which can convert the DOS FAT file system to OS/2 HPFS on-the-fly, leaving all your files intact. Partition Magic also allows you (free space permitting) to repartition your hard disk without destroying any files. This utility can save an enormous amount of time in managing your hard disks. Contact your favorite OS/2 Warp software dealer to order Partition Magic.

(1.6) Why Choose OS/2 Warp?

Why should I choose OS/2 Warp over its competitors?

There are many products which compete with OS/2 Warp, at least to some extent. Before comparing OS/2 Warp with those products, it is important to understand what strengths OS/2 Warp brings to the table.

OS/2 Warp requires a PC with a 386SX (or better) and preferably 6 MB of RAM (or more). If you do not have the hardware required to run OS/2 Warp (and cannot conveniently upgrade), other choices should be considered. However, OS/2 Warp is considered by far the "lightest" (in terms of resource requirements) of all the new crop of 32-bit operating systems (which includes Microsoft NT, NeXTStep, Novell UnixWare, and Solaris). Furthermore, IBM has made great strides in reducing the amount of memory required by OS/2 Warp. A PC which is well-equipped to run Windows for DOS is also well-equipped to run OS/2 Warp.

OS/2 Warp is based on a stable, proven design (which started with OS/2 1.0, introduced in 1987). Today's OS/2 Warp barely resembles Version 1.0, yet applications written for that version still run under OS/2 Warp, unmodified. OS/2 1.x found ready markets in so-called "mission critical" applications, including automatic teller machines for banking, point-of-sale systems, process control and factory automation, network software, and more. Other operating systems (particularly NT) have not had the benefit of a long period of testing and reliable operation.

As noted in (1.3) DOS and Windows Compatibility, OS/2 Warp is generally acknowledged to be the most DOS and Windows compatible 32-bit operating system on the market. OS/2 Warp users have access to the broad range of software written for these environments (in addition to the growing library of native OS/2 Warp software) without sacrificing compatibility or performance. Again, this ability stands in contrast to the mediocre DOS and Windows compatibility (and performance) found in such operating systems as NT, NeXTStep, Solaris, UnixWare, Linux, and others. NT, for example, cannot tolerate most DOS device drivers, has no specific DOS session features, and will not run DOS graphics applications in windows on the desktop. (NT also does not include any support for PCMCIA cards or Advanced Power Management, so common in notebook computers.) IBM calls OS/2 Warp "the integrating platform" because it actually lends functionality to all applications, even if you only run DOS and Windows programs.

Currently DOS (with or without Windows) is the most common operating environment on PCs (with OS/2 Warp in second place and closing the gap). OS/2 Warp provides several advantages over plain DOS/Windows, such as:

• Preemptive multitasking. OS/2 Warp can run more than one application at the same time, and no application can ever take all the CPU attention away from the other tasks. Downloading files, formatting diskettes, printing, mathematically intensive tasks, and other computer-hogging jobs can run reliably, in the background, freeing your computer so you can work more effectively and save time.
• Multithreading. OS/2 Warp applications can be written to use threads (also known as subtasks). Threads also run in the background so that an application never stops responding to your input. For example, with the DeScribe word processor's multithreaded printing, you can tell the application to print the file then immediately make another revision, without waiting for the document to even spool to the print queue.
• Enhanced Configurability. Your DOS applications, for example, can have individually tailored CONFIG.SYS settings -- no rebooting required. So, if you want to play that game of Wing Commander, you do not have to get rid of your TSRs and network drivers beforehand.
• Crash Protection. Every application running under OS/2 Warp is isolated from all the other applications. If one application decides to write to random areas of memory, OS/2 Warp will promptly notify you of the offense. All your other applications continue to run, unharmed. Neither DOS nor Windows offer such complete protection. For example, if you have a Windows application which likes to crash (cause a GPF error), OS/2 Warp can run it in a separate Win-OS/2 session. If the application self destructs, all your other DOS, Windows, and OS/2 Warp applications which may be running never miss a beat. No operating system is totally crash proof, but OS/2 Warp is widely considered to be extremely reliable, both because of its design and because of its maturity.
• Workplace Shell. Literally millions of dollars are spent on Windows desktop replacements and accessories (such as Norton Desktop, PC Tools, and so on). If you do not like the Windows Program Manager and File Manager (still available under OS/2 Warp), OS/2 Warp's Workplace Shell is worthy of your attention. Folders can be nested. Objects (including files) can have long names (so you don't have to remember what "Y6EDGQTR.ILK" means). Your desktop is almost infinitely customizable: every folder can have a different color or background, for example. And consistency is maintained throughout the Workplace Shell. Want to print a file? Drag it to the printer object. Fax it? Drag it to the Fax object. Open it? Drag it to an application program object. Delete it? Drag it to the Shredder.
• Access to OS/2 Warp Applications. There's only one way to add OS/2 Warp applications to your PC: add OS/2 Warp. Many of these applications are not available for any other operating system. For example, Watcom's VX-REXX and HockWare's VisPro/REXX let you create fully graphical applications in no time flat. (VX-REXX recently won PC Magazine's Editor's Choice award.) Lotus cc:Mail for OS/2, which takes full advantage of the Workplace Shell, makes e-mail simple. IBM's Ultimedia Builder/2, Workplace/2, and Manager/2 are the best multimedia authoring tools available anywhere, better than anything for Windows, says PC Magazine. And you can only play Galactic Civilizations for OS/2, the Number 1 PC game according to a recent Internet list, when you're running OS/2. OS/2 Warp allows you to run the largest library of 32-bit applications available for the PC.

OS/2 Warp costs less (much less) than its competitors. OS/2 Warp is a best seller and continues to gain ground on plain DOS/Windows, meaning application developers and hardware manufacturers take notice (most recently Corel Systems and Toshiba). OS/2 Warp is likely to be the most popular operating system on PowerPC systems. OS/2 Warp coexists peacefully with your existing DOS/Windows setup (using either DualBoot or Boot Manager), so you can make the switch at your own pace. OS/2 Warp continues to capture industry awards. Most recently, Windows Magazine named OS/2 to its Top 100 list. And, for the second straight year, OS/2 won Overall Product of the Year from the readers of Infoworld. (OS/2 also earned Infoworld's Software Product of the Year and the Interoperability Award. In fact, OS/2, with three of the highest awards all to itself, was the only product to win more than one award.) As an OS/2 Warp user, you'll be joining the over eight million OS/2ers around the world who are experiencing a new level of performance when they use their PCs.

But shouldn't I wait for Windows95 ("Chicago")?

Most industry observers believe that Chicago (Windows95) will not be available until far into 1995. In other words, Microsoft is promising a product which will offer some of OS/2 Warp's features at some point in the future. Even if you think you are interested in Chicago, OS/2 Warp will not suddenly render your PC unable to run it. So why not upgrade to OS/2 Warp in the meantime?

Yet there are several good reasons why you may not be making that upgrade. First, like most first releases, Chicago will suffer from its share of bugs. It will take a considerable amount of time (and expense) to solve these problems. Second, OS/2 Warp is by no means standing still. By the time Chicago is released, OS/2 Warp could possibly enjoy another upgrade. (The time between new releases of OS/2 has been averaging about 14 months. The last major Windows update, Version 3.1, was introduced in April, 1992.) In other words, it will have features (such as support for Symmetric Multiprocessing and the PowerPC) that are not even contemplated for Chicago. Or, in still other words, vaporware (software which does not yet exist) always sounds more appealing than real software on the surface, because software vendors can make whatever claims they like.

Chicago will not support any OS/2 Warp applications (whose number is only growing with time). On the other hand, OS/2 Warp now supports the Win32s programming interface for 32-bit Windows applications. The resource requirements for Chicago will increase over Windows 3.1 (at the same time IBM has fine tuned OS/2 Warp to use less memory and perform better) -- at best Chicago will demand a PC no less powerful than that demanded by OS/2 Warp.

Byte and Windows Sources have pointed to some architectural problems with Chicago. These publications have cited Chicago's pervasive use of 16-bit subsystems (which will cause "thunking," i.e. a performance hit for calls made by 32-bit applications), failure to protect 16-bit Windows applications from crashing the entire system (which OS/2 Warp already prevents), and the 16-bit locking mechanism (which means that 16-bit Windows applications will not be preempted by Chicago, possibly resulting in hung background file transfers, poor multimedia performance, and other problems, even for 32-bit applications). Moreover, reportedly all video and network device drivers for Windows 3.1 must be rewritten to work with Chicago. A recently published book, "Undocumented Windows95," even suggests that new 32-bit Windows applications may still depend on real mode vestiges from ordinary DOS.

Finally, Microsoft made similar promises (on the overwhelming success to be achieved by NT and Windows for Workgroups, most recently). These promises have not come to pass. It is far from certain whether Chicago will satisfy the marketplace.

For a concise, researched, official view of OS/2 Warp when compared to the as-yet-unreleased Windows95, IBM has published a whitepaper which is available from online services such as CompuServe and the Internet.