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  showwindow                                                            WNDWC
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  Function       Shows a hidden window to become the current top window on
                 the CRT.
  Syntax         void showwindow( int windowname );
  Remarks        The underlay is saved from the screen and the window is
                 restored from RAM to become the new top window.  Invalid
                 window names are simply ignored.  Virtual windows are
                 updated before being shown.  Zoom effect is optional.
  Return value   None.
  Screens        All video pages.
  EOS            Set to (1,1).
  Heap           Temporarily uses (underlay size * 1.5).
  Upon return    Forced to write to CRT.