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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _wgetscreenbuf function returns the size of a QuickWin window
     screen buffer. This routine is used only in QuickWin programs; it
     is not part of the Windows API. For full details about QuickWin,
     see Chapter 8 of the Programming Techniques manual.
 
     Each QuickWin child window has a buffer in which the screen-
     display text for the window is stored. The buffer size determines
     how much text is retained and thus how much output can be viewed
     by scrolling back through the window.
 
     By default, the screen-buffer size is 2048 bytes, but this value
     can be changed.
     See: _wsetscreenbuf
 
     Return Value
 
     If successful, the _wgetscreenbuf function returns the current
     screen-buffer size (in bytes) or the value _WINBUFINF. (A value
     of _WINBUFINF signifies that the size of the screen buffer is
     unlimited.) A return value of -1 indicates an error.
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