+ X/Open does not define any error conditions. In this im-
+ plementation
+
+ <STRONG>prefresh</STRONG> and <STRONG>pnoutrefresh</STRONG>
+ return an error if the window pointer is null,
+ or if the window is not really a pad or if the
+ area to refresh extends off-screen or if the
+ minimum coordinates are greater than the maxi-
+ mum.
+
+ <STRONG>pechochar</STRONG>
+ returns an error if the window is not really a
+ pad, and the associated call to <STRONG>wechochar</STRONG> re-
+ turns an error.
+
+ <STRONG>pecho_wchar</STRONG>
+ returns an error if the window is not really a
+ pad, and the associated call to <STRONG>wecho_wchar</STRONG>
+ returns an error.
+