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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.
Lotus 1-2-3 was an early spreadsheet application available for MS-DOS. It became extremely popular in the late 1980s, displacing the former leader VisiCalc. Lotus had difficulties adapting 1-2-3 to the Windows environment, and was overtaken by Microsoft Excel. Spreadsheet functionality was also included in Lotus Symphony. Later versions were included in Lotus SmartSuite.