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Curses is the unix toolkit for displaying text based [GUI]'s. Curses is used for all sorts of operations on a terminal, the most important of which include drawing and removing text, colouring/hilighting text, and moving the cursor around. Curses originally grew out of vi(1) I believe, and was very optimised for sending the least number of escape codes to update the screen from the old representation to the new representation, which means that it worked really well over low speed serial. (On the flipside, now it works over very laggy tcp connections really well too :). Curses has been replaced and rewritten and is usually called "ncurses" now. make menuconfig for instance, uses a Curses interface, as do most text editors. __ncurses__ is simply an implementation of the curses [API]. ncurses is the implementation used by most [Linux] software - ncurses is under the [GPL] so only GPL-compatible programs may link against it. From the start of the man page: ;__DESCRIPTION__: The ncurses library routines give the user a terminal-independent method of updating character screens with reasonable optimization. This implementation is "new curses" (ncurses) and is the approved replacement for 4.4BSD classic curses, which has been discontinued. See the ncurses(3X) man page for an overview and link to the other functions' man pages, or see [HowToNCURSESProgrammingHOWTO] for lots of information (including a good introduction to terminals and ncurses).
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