+to \fBENOMEM\fR.
+.PP
+X/Open does not define any error conditions.
+In this implementation
+.RS
+.TP 5
+\fBprefresh\fP and \fBpnoutrefresh\fP
+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 maximum.
+.TP 5
+\fBpechochar\fP
+returns an error
+if the window is not really a pad, and the associated call
+to \fBwechochar\fP returns an error.
+.TP 5
+\fBpecho_wchar\fP
+returns an error
+if the window is not really a pad, and the associated call
+to \fBwecho_wchar\fP returns an error.
+.RE