+.SS has_mouse
+The \fB\%has_mouse\fP function returns \fBTRUE\fP if the mouse driver
+has been successfully initialized,
+and \fBFALSE\fP otherwise.
+.PP
+Mouse events are ignored when input is in cooked mode, and
+cause an error beep when cooked mode is being simulated in a window by a
+function such as \fB\%getstr\fP that expects a linefeed for input-loop
+termination.