-i.e., the \fB^\fR\fIX\fR notation used by \fBunctrl\fR(3X).
-Calling \fBwinch\fR after adding a
+using the same convention as \fBunctrl\fR(3X):
+.bP
+Control characters are displayed in the \fB^\fIX\fR notation.
+.bP
+Values above 128 are either meta characters (if the screen has not
+been initialized, or if \fBmeta\fP(3X) has been called with a \fBTRUE\fP E parameter),
+shown in the \fBM\-\fIX\fR notation, or are displayed as themselves.
+In the latter case, the values may not be printable;
+this follows the X/Open specification.
+.PP
+Calling \fBwinch\fP after adding a