-</PRE>
-<H2>RETURN VALUE</H2><PRE>
- Routines that return pointers return <STRONG>NULL</STRONG> on error. Rou-
- tines that return an integer return one of the following
- error codes:
+ In the <STRONG>set_</STRONG> functions, window argument of <STRONG>NULL</STRONG> is treated as though it
+ were <STRONG>stsdcr</STRONG>. A form argument of <STRONG>NULL</STRONG> is treated as a request to change
+ the system default form window or subwindow.
+
+ The function <STRONG>scale_form</STRONG> returns the minimum size required for the
+ subwindow of <EM>form</EM>.
+
+
+</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
+ Routines that return pointers return <STRONG>NULL</STRONG> on error. Routines that
+ return an integer return one of the following error codes: