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        Return object handle

        Entry:
          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
               10h   /

        Return:
          DWORD on top of stack is object handle