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  wscrollup                                                             WNDWC
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  Function       Scrolls the current window up and clears the bottom row with
                 the window attribute wndwattr.
  Syntax         void wscrollup(void);
  Remarks        The first row of the window will be scrolled out and lost
                 while the last row will be cleared (SAMEATTR is permitted).
                 The cursor is not moved, but is ready to be moved with
                 wgotoeos as EOS is set to the first column of the cleared
                 row.
  Return value   None.
  Screens        All video pages and virtual screens.
  EOS            Updated to first cleared column of the cleared row.
  Restrictions   None.