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DesignCAD is a low end, but well featured, drafting program. It was sometime a companion product to DesignCAD 3D.
The IBM 3270 Personal Computer High Level Language Application Program Interface (abbreviated "HLLAPI") is a software tool which enables users to develop microcomputer applications that transparently establish 3270 emulation sessions when host data is needed.
Communications Manager/2 is a server component for OS/2 1.3 that provides connectivity with IBM mainframes and acts as a gateway for OS/2, DOS, and Windows clients.