INT 33H 0019H: Query User Alternate Event Handler
Expects: AX 0019H
CX event mask of desired handler (as used in INT 33H 0018H)
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Returns: CX event mask of handler or...
0000H = no handler matches
ES:DX address of matching event handler
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Info: Use this function to obtain the address and mask of an alternate
event handler installed via INT 33H 0018H (which see for the bit
values for CX).
See Also: INT 33H: Mouse Support
Interrupts and BIOS Services
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