Int 33H Function 18H allows as many as three event handlers with distinct event masks to be installed. This function can be called to search for a handler that matches a specific event, so that it can be replaced or disabled.Returns the address for the mouse event handler matching the specified event mask.
Call with:
AX = 0019H
CX = event mask (see Int 33H Function 18H)
Returns:
If function successful
CX = event mask
ES:DX = segment:offset of alternate event handler
If function unsuccessful (no handler installed or event mask does not match any installed handler)
CX = 0000H
Note:
Int 33H Function 18H allows as many as three event handlers with distinct event masks to be installed. This function can be called to search for a handler that matches a specific event, so that it can be replaced or disabled.