- The functions <STRONG>show_panel</STRONG> and <STRONG>top_panel</STRONG> are identical in this implemen-
- tation, and work equally well with displayed or hidden panels. In the
- native System V implementation, <STRONG>show_panel</STRONG> is intended for making a
+
+</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
+ Reasonable care has been taken to ensure compatibility with the native
+ panel facility introduced in System V; inspection of the SVr4 manual
+ pages suggests the programming interface never changed. The <EM>PANEL</EM> data
+ structures are merely similar. The programmer is cautioned not to
+ directly use <EM>PANEL</EM> fields.
+
+ The functions <STRONG>show_panel</STRONG> and <STRONG>top_panel</STRONG> are identical in this
+ implementation, and work equally well with displayed or hidden panels.
+ In the System V implementation, <STRONG>show_panel</STRONG> is intended for making a