+</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
+ X/Open Curses, Issue 4 describes these functions.
+
+ SVr4 describes successful return values only as "an integer value other
+ than <STRONG>ERR</STRONG>".
+
+
+</PRE><H2><a name="h2-HISTORY">HISTORY</a></H2><PRE>
+ SVr4 (1989) implemented these functions under the names <STRONG>inswch</STRONG>,
+ <STRONG>winswch</STRONG>, <STRONG>mvinswch</STRONG>, and <STRONG>mvwinswch</STRONG>.