+implementation does not yet support.
+.SH RETURN VALUE
+All routines return the integer \fBOK\fR on success, or \fBERR\fP on failure.
+.PP
+X/Open does not define any error conditions.
+.PP
+This implementation returns an error
+if the window pointer is null.
+The \fBwcolor_set\fP function returns an error if the color pair parameter
+is outside the range 0..COLOR_PAIRS\-1.
+This implementation also provides
+\fBgetattrs\fR
+for compatibility with older versions of curses.
+.PP
+Functions with a "mv" prefix first perform a cursor movement using
+\fBwmove\fP, and return an error if the position is outside the window,
+or if the window pointer is null.