## An Anatomy of Guile, The Interface to Tcl/Tk

Thomas Lord
Cygnus Support

#### Abstract

Guile is an extension language library consisting of a virtual machine, run-time system, and front ends for multiple languages. Guile has been closely integrated with Tcl/Tk [Ousterhout] so that Tcl and Tk modules can be used by Guile programs, and Guile programs can be used to extend Tcl/Tk applications. This paper gives an overview of the structure and function of Guile, and includes some notes about how it is expected to evolve in the future. The technical relation between Tcl/Tk and Guile is given special attention.

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