This is a C++ interface to the ncurses library. This library provides menubars, popup menus, various dialog boxes, and controls (push buttons, check buttons etc.).
My opinion is that the documentation, which contains at least one example program, is adequate, though some exposition to wrap around the bare descriptions of the API would be welcome. I have to say that there seems to be a complete absence of end-user support for this product, which is very disappointing, since I have been unable to successfully generate the NDK++ package. As such, I have to change my original rating to "useless".
Very easy to use ndk-xx