Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 15h Function 85h
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     The ROM BIOS handler for this function call is a dummy routine
     that always returns a success status unless called with an invalid
     subfunction number in AL. A multitasking program manager would be
     expected to capture Int 15h so that it can be notified when the
     user strikes the SysReq key.
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