AOLserver Tcl Extensions

Tcl is a programming system developed by John Ousterhout at the University of California, Berkeley*

. According to Dr. Ousterhout:

Tcl is a simple scripting language for controlling and extending applications; its name stands for "tool command language". Tcl provides generic programming facilities, such as variables and loops and procedures, that are useful in a variety of applications. Furthermore, Tcl is embedable. Its interpreter is a library of C procedures that can easily be incorporated into applications, and each application can extend the core Tcl features with additional commands for that application.

When you write AOLserver extensions in Tcl, you use the core functionality of Tcl as well as a set of AOLserver-specific functions. For example, there is an AOLserver function called ns_conn that allows your Tcl script to obtain information about the current connection. In addition, functions are available for returning results to Web clients and accessing the database.

This chapter describes the AOLserver-specific functions for Tcl. Chapter 3 documents the core Tcl commands. More information about the Tcl language is available from Dr. Ousterhout's book*

and on the World Wide Web*

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