Get object size

        Entry:
          AH = 12h
          BH = 08h
          BL = object
               00h handle in DWORD on top of stack
                   Timer: elapsed time since timer started
                   Pointer: number of messages queued to pointer object
                   Panel: number of panels in panel file
               01h total chars in current task's default window
               02h number of messages in task's mailbox
                   (task's handle on stack)
               03h number of messages in current task's mailbox
               04h number of input buffers queued in task's kbd
                   (handle on stack)
               05h number of input buffers queued for current task's
                   default kbd
               06h number of objects queued in OBJECTQ
                   (task's handle on stack)
               07h number of objects queued in current task's OBJECTQ

        Return:
          DWORD on stack is result