+
+</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
+ These functions are described in the XSI Curses standard, Issue 4. The
+ standard specifies that they return <STRONG>ERR</STRONG> on failure, but specifies no
+ error conditions.
+
+ The SVr4.0 manual says that these functions could return "a non-nega-
+ tive integer if <STRONG><A HREF="curs_outopts.3x.html">immedok(3x)</A></STRONG> is set", referring to the return-value of
+ <STRONG>wrefresh</STRONG>. In that implementation, <STRONG>wrefresh</STRONG> would return a count of the
+ number of characters written to the terminal.
+
+ Some historic curses implementations had, as an undocumented feature,
+ the ability to do the equivalent of <STRONG>clearok(...,</STRONG> <STRONG>1)</STRONG> by saying <STRONG>touch-</STRONG>
+ <STRONG>win(stdscr)</STRONG> or <STRONG>clear(stdscr)</STRONG>. This will not work under ncurses.
+
+ This implementation, and others such as Solaris, sets the current posi-
+ tion to 0,0 after erasing via <STRONG>werase</STRONG> and <STRONG>wclear</STRONG>. That fact is not doc-
+ umented in other implementations, and may not be true of implementa-
+ tions which were not derived from SVr4 source.
+
+ Not obvious from the description, most implementations clear the screen
+ after <STRONG>wclear</STRONG> even for a subwindow or derived window. If you do not
+ want to clear the screen during the next <STRONG>wrefresh</STRONG>, use <STRONG>werase</STRONG> instead.
+
+
+</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
+ <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_outopts.3x.html">curs_outopts(3x)</A></STRONG>, <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>, <STRONG><A HREF="curs_variables.3x.html">curs_variables(3x)</A></STRONG>