Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Important Notice
The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.
DOS Idle Interrupt
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     Int 28h allows TSRs that call DOS to safely interrupt
     certain DOS functions. These functions set up a stack that the
     TSR must preserve by not calling any of the functions listed on
     the Summary screen. However, the TSR may call other DOS services.
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