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  setwindowmodes                                                        WNDWC
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  Function       Sets the window modes to be used by makewindow.
  Syntax         void setwindowmodes( int sumofallmodes );
  Remarks        There are several different modes that can be used:

     RELMODE       - Window-relative frame of reference, no underlay
     PERMMODE      - Can't be moved or removed, no underlay
     SHADOWLEFT    - Shadow on the left side
     SHADOWRIGHT   - Shadow on the right side
     ZOOMMODE      - Zoom effect on make, show and accesswindow
     HIDDENMODE    - Create window as hidden
     VIRTUALMODE   - Create virtual screen as well
     CURSOROFFMODE - Leaves cursor off for window
     SEETHRUMODE   - Doesn't clear area inside window
     NOHIDEMODE    - Ignores request to hide window
     NOACCESSMODE  - Ignores request to access window
     NOMOVEMODE    - Ignores request to move/resize window

                 The startup mode is equivalent to zero while the base window
                 is PERMMODE.  The modes should be summed logically, but can
                 also be done arithmetically with care.  All PERMMODE windows
                 must be created first.
  Return value   None.
  Example        Set the modes for the next window to have a right shadow,
                 zoom effect, cursor off, and a virtual screen:

                   setwindowmodes( SHADOWRIGHT | ZOOMMODE | CURSOROFFMODE
                                   | VIRTUALMODE );

  Example        Set the modes back to defaults:

                   setwindowmodes( 0 );