-All routines return the integer \fBERR\fR upon failure and an \fBOK\fR (SVr4
-specifies only "an integer value other than \fBERR\fR") upon successful
-completion.
+All routines return the integer \fBERR\fP upon failure and an \fBOK\fP
+(SVr4 specifies only
+\*(``an integer value other than \fBERR\fP\*('')
+upon successful completion.
+.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.