OS/2 Device Driver Kit On-Line
The OS/2 Device Driver Kit On-Line was a web site including IBM OS/2 source code and documentation to produce device driver for the OS/2 platform.
The OS/2 Device Driver Kit On-Line was the continuation of the "IBM Developer Connection Device Driver Kit for OS/2" but this time it was available through a web site and not CD's distribution.
From 2004 till it was discontinued on 2006 it was available as part of the IBM's Passport Advantage with Software Maintenance subscription (approximately at December of 2004) 
This page was discontinued (Approximately Feb 2007 ) and it is not available anymore on the web.