- A few functions are extensions added for ncurses, e.g., <STRONG>form_driver_w</STRONG>,
- <STRONG>unfocus_current_field</STRONG>.
+ The menu facility was documented in SVr4.2 in <EM>Character</EM> <EM>User</EM> <EM>Interface</EM>
+ <EM>Programming</EM> <EM>(UNIX</EM> <EM>SVR4.2)</EM>.
+
+ It is not part of X/Open Curses.
+
+ Aside from ncurses, there are few implementations:
+
+ <STRONG>o</STRONG> systems based on SVr4 source code, e.g., Solaris.
+
+ <STRONG>o</STRONG> NetBSD curses.
+
+ A few functions in this implementation are extensions added for
+ ncurses, but not provided by other implementations, e.g.,
+ <STRONG>form_driver_w</STRONG>, <STRONG>unfocus_current_field</STRONG>.