HP Distributed Smalltalk
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A version of Smalltalk created by the HP company in the early 90's, that featured a distributed CORBA based object system. Initial version ran on HP-UX and Microsoft Windows 3.x, but after some input from IBM eas ported to SOM and made available for AIX and OS/2. Code is fully abstracted from the host OS so an application written for one host OS will be portable to others without any code change.
Links and publications
http://www.hpl.hp.com/hpjournal/95apr/apr95a11.pdf