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  writetovirtual                                                        WNDWC
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  Function       Prepares QWIKC and WNDWC to write to a virtual screen.
  Syntax         void writetovirtual( int windowname );
  Remarks        This function switches to writing to a virtual screen.  The
                 window must be a valid window name, otherwise, the program
                 is terminated with an error message.
  Return value   None.
  EOS            Restored to virtual screen.