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INT 15 - TopView - SEND MESSAGE - "SIZEOF" - GET OBJECT SIZE
        AH = 12h
        BH = 08h
        BL = object
            00h handle in DWORD on top of stack
                window: total character positions in window
                timer: elapsed time since timer started
                pointer: number of messages queued to pointer object
                panel: number of panels in panel file
                keyboard: number of input buffers queued
            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
            0Ch (DV 2.26+) total chars in window owning handle on top of stack
            0Dh (DV 2.26+) total chars in parent task's window
Return: DWORD on top of stack is result
Note:   for panel objects, a count of zero is returned if no panel file is open
          for the object
SeeAlso: AH=12h/BH=04h,AH=12h/BH=09h