+.PP
+This implementation, and others such as Solaris,
+sets the current position to 0,0 after erasing
+via \fBwerase()\fP and \fBwclear()\fP.
+That fact is not documented in other implementations,
+and may not be true of implementations
+which were not derived from SVr4 source.
+.PP
+Not obvious from the description,
+most implementations clear the screen after \fBwclear\fP
+even for a subwindow or derived window.
+If you do not want to clear the screen during the next \fBwrefresh\fP,
+use \fBwerase\fP instead.