+.SH EXTENSIONS
+This implementation provides four functions which may be used to detect
+if the corresponding flags were set or reset:
+.TS
+l l l
+_ _ _ _
+l l l .
+\fBQuery\fP \fBSet\fP \fBReset\fP
+is_cbreak cbreak nocbreak
+is_echo echo noecho
+is_nl nl nonl
+is_raw raw noraw
+.TE
+.PP
+In each case, the function returns
+.TP 5
+1
+if the flag is set,
+.TP 5
+0
+if the flag is reset, or
+.TP 5
+-1
+if the curses library was not initialized.
+.PP
+These routines are specific to ncurses.
+They were not supported on Version 7, BSD or System V implementations.
+It is recommended that any code depending on ncurses extensions
+be conditioned using NCURSES_VERSION.