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  removewindow                                                          WNDWC
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  Function       Removes the current top window on the CRT.
  Syntax         void removewindow(void);
  Remarks        Basically, the top window is removed restoring the underlay
                 and then erased from memory.  Depending on the window mode,
                 removewindow responds differently:

                   RELMODE     - The window-relative stats are simply
                                 replaced with the parent window stats.
                   PERMMODE    - The stats are simply dropped from the stack.
                   VIRTUALMODE - The virtual screen is additionally removed
                                 from the heap.

  Return value   None.
  Screens        All video pages.
  EOS            Restored to the new top window.
  Heap           Deallocates the underlay.
  Upon return    Forced to write to CRT.