The S-Lang programming library, development version S-Lang is a C programmer's library that includes routines for the rapid development of sophisticated, user friendly, multi-platform applications. The S-Lang library includes the following: * Low level tty input routines for reading single characters at a time. * Keymap routines for defining keys and manipulating multiple keymaps. * A high-level key processing interface (SLkp) for handling function and arrow keys. * High level screen management routines for manipulating both monochrome and color terminals. These routines are very efficient. (SLsmg) * Low level terminal-independent routines for manipulating the display of a terminal. (SLtt) * Routines for reading single line input with line editing and recall capabilities. (SLrline) * Searching functions: both ordinary searches and regular expression searches. (SLsearch) * An embedded stack-based language interpreter with a C-like syntax.