.B OK
button is provided anyway.
.PP
+If the
+.I message
+is
+.RB ` \- '
+then instead the message to display is read from standard input. If the
+first character of
+.I message
+is
+.RB ` % '
+then that character is removed.
+.PP
A button may be selected as being the default (i.e., may be chosen by
pressing
.IR enter ),