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  wwrite                                                                WNDWC
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  Function       Writes a string relative to the current window using the
                 window attribute.
  Syntax         void wwrite( unsigned char row, unsigned char col,
                              char *astr );
  Remarks        This routine writes the string astr at window-relative
                 (row,col) with the attribute wndwattr from the window
                 record.  If SAMEATTR is used for wndwattr, then the
                 attributes will remain the same on the screen.
  Return value   None.
  Screens        All video pages and virtual screens.
  EOS            Updated.
  Restrictions   Stay within the window limits.  Long strings will not wrap
                 around to column 1.
  Example        Write the string "Enter" at (2,1) with the current window
                 attribute:

                   wwrite( 2, 1, "Enter" );

  Example        Write the string "Answer" at (2,1) with the attribute of
                 flashing white on red and then restore the current window
                 attribute:

                   tws.wndwattr = BLINK+WHITE+RED_BG;
                   wwrite( 2, 1, "Answer" );
                   tws.wndwattr = tws.origattr;