a) This function will
use a real mode callback that was allocated by the DOS/32 Advanced at startup
to pass the control from real mode mouse handler to your protected mode
interrupt handler.
b) Calling this function
with zero values in ES:EDX (0000:00000000h) will uninstall the insalled
protected mode interrupt handler.
c) The protected mode
program should not rely on error codes reported by this function in AX
register since different mouse drivers will return different values on
error.