explain a non-portable behavior
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.\" $NetBSD: curses_line.3,v 1.4 2003/04/16 13:35:01 wiz Exp $
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.\" $NetBSD: curses_line.3,v 1.5 2010/02/19 19:09:15 drochner Exp $
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.\"
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.\" Copyright (c) 2002
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.\" Brett Lymn (blymn@NetBSD.org, brett_lymn@yahoo.com.au)
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@ -154,6 +154,18 @@ The
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.Nx
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Curses library complies with the X/Open Curses specification, part of
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the Single Unix Specification.
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.Pp
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The use of
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.Dv ACS_HLINE
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and
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.Dv ACS_VLINE
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as default drawing character in
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.Fn hline
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and
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.Fn vline
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is a
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.Nx
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extension which should not be relied on in portable code.
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.Sh HISTORY
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The Curses package appeared in
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.Bx 4.0 .
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