The library contains functions for memory allocation, bit arrays, configuration files, comparing standard C types for qsort and bsearch, error messages, expression parsing and evaluation, filenames, hash tables, integer sets, log files, the Linux Software Map, NNTP, priority queues, normal queues, editor buffers, stacks, and strings. This module contains some add-on Python modules useful for Python programmers. It has no text mode user interface. It doesn't have very many features. The primary attraction is the mouse language, which is almost identical to xterm's, but clicking the middle mouse button inside a selection cuts it instead of pasting it.
SeX is still under development, and is known to be buggy.