INT 33 - MS MOUSE v6.0+ - RETURN USER ALTERNATE INTERRUPT VECTOR AX = 0019h CX = call mask (see #03174) Return: BX:DX = user interrupt vector CX = call mask (0000h if not found) Note: attempts to find a user event handler (defined by function 18h) whose call mask matches CX SeeAlso: AX=0018h