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INT 15 - TopView - SEND MESSAGE - "OPEN" - OPEN OBJECT
        AH = 12h
        BH = 0Ch
        BL = object
            00h handle is DWORD on top of stack
                window:   fill with given character from scroll origin to end
                keyboard: attach to a window
                timer:    open
                pointer:  start taking input for window
                panel:    associate with a panel file
            01h fill task's default window with given char from scrl org to end
            02h open given task's mailbox for input (task's handle on stack)
            03h open current task's mailbox
            04h attach a KEYBOARD to a window (handle on top of stack)
            05h attach task's default KEYBOARD to a window
            06h open a task's OBJECTQ (task's handle on top of stack)
            07h open current task's OBJECTQ
            0Ch (DV 2.26+) fill def window of task owning handle on top of stck
            0Dh (DV 2.26+) fill default window of parent of current task
         STACK: (if window)   DWORD character to fill with
                (if keyboard) DWORD handle of window to attach to
                (if pointer)  DWORD handle of window to attach to
                (if panel)    DWORD length of filename or resident panel
                              DWORD address of filename or resident panel
                (otherwise)   nothing
Notes:  if first byte of panel file name is 1Bh, then the "name" IS a panel
        if first two bytes of panel file "name" are C0hC3h, then the "name" IS
          the panel file
        result code of open may be retrieved with STATUS message
        logical cursor is left at scroll origin after filling window
        the task opening a mailbox becomes its owner, and the only task allowed
          to read the mailbox
        messages are only sent to a pointer object when the mouse is positioned
          in the window to which the pointer has been attached
        there is no need to explicitly open a timer object, as ADDTO and WRITE
          messages automatically open the timer
SeeAlso: AH=12h/BH=0Dh,AH=12h/BH=14h"LOCK"