-This implementation checks for null pointers, returns ERR in that case.
-Also, the \fImv\fR routines check for error moving the cursor, returning ERR
-in that case.
-Otherwise they return OK
+This implementation checks for null pointers, returns \fBERR\fP in that case.
+Also, the \fImv\fR routines check for error moving the cursor,
+returning \fBERR\fP in that case.
+Otherwise they return \fBOK\fP.
+.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.