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INT 15 - TopView - SEND MESSAGE - "HANDLE" - RETURN OBJECT HANDLE
        AH = 12h
        BH = 00h
        BL = which handle to return
            00h handle in DWORD on top of stack
            01h current task's window handle
            02h given task's mailbox handle (task's handle on stack)
            03h current task's mailbox handle
            04h given task's keyboard handle (task's handle on stack)
            05h current task's keyboard object handle
            06h given task's OBJECTQ handle (task's handle on stack)
            07h current task's OBJECTQ handle
            08h   \
              thru > return 0000:0000 under DV < 2.26
            10h   /
            0Ch (2.26+) task owning object with handle in DWORD on top of stack
            0Dh (2.26+) task handle of owner (parent) of current task
Return: DWORD on top of stack is object handle
Note:   BL=0Ch,0Dh returns 00000000h if the object is not open (keyboard,
          mailbox, panel, pointer, and timer objects) or is an orphan (task,
          window)