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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.
Borland Sidekick is a DOS based PIM (Personal Information Manager) and one of the first widely-used TSR (terminate and stay resident) programs. The key feature of Sidekick was that one could use Sidekick's utilities while using most other MS-DOS applications. This was important because MS-DOS had no built-in multi-tasking or task switching capabilities.