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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.
The IBM PC Local Area Network Program (1.00 is just named "IBM PC Network Program") is an IBM rebadged version of Microsoft's MS-NET (later Lan Manager). It is a program that lets any workstation on a network share resources, such as drives or printers, with other workstations.