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  How do 16-bit programs start up?
Time: 00:00 EST/05:00 GMT | News Source: Microsoft | Posted By: Kenneth van Surksum

Back in 16-bit Windows, MS-DOS cast a long and dark shadow. The really ugly low-level munging was very much in the MS-DOS spirit. You opened files by setting up registers and issuing an int 21h, just like in MS-DOS. Although the interrupt went to Windows instead, Windows maintained the MS-DOS calling convention. Process startup followed the same "real men write in assembly language" philosophy.

All the parameters to a 16-bit program were passed in registers.

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