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_wgetscreenbuf
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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:   <io.h>
 
  Syntax:    long _wgetscreenbuf( int wfh );
 
  Returns:   Current screen-buffer size (in bytes) or the value
             _WINBUFINF, or -1 if not successful.
 
  See also:  _fwopen, _wabout, _wclose, _wgetexit, _wgetfocus,
             _wgetsize, _wmenuclick, _wopen, _wsetexit, _wsetfocus,
             _wsetscreenbuf, _wsetsize, _wyield
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