A scripting language for controlling and extending applications. Tcl is pronounced "tickle."

Tcl is similar to many shell scripting languages and other high-level programming languages. Its structure is less complex than that of C++ or Java, yet it can support control structures, variables, access to network sockets, and APIs for integrating applications. You can program at a higher level of abstraction than with C or C++. In addition, in Tcl, you do not have to address as many details as you would in C.

Tcl is extensible; that is, you can create your own commands and procedures if the functionality you want is not available as a supplied command. Tcl is an interpreted language rather than a compiled language, and works well across most development platforms, including UNIX and NT.