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Tcl/Tk
Tcl (short for Tool Command Language, developed by John Ousterhout) is
an embeddable and extensible scripting language. In other words, Tcl
sits inside VMD as a language interpreter where it can execute its
standard language commands or the various VMD specific extensions.
There are several reasons for using Tcl rather than writing our own language,
the most important being that it is easy to use, it was easy to modify
our code to use it, it has few bugs, and documentation is available at
many bookstores. Many other packages use it, including Quanta. It is
not necessary that you know Tcl to use VMD. However, it is useful for
some occasions, like making movies or scripts.
VMD uses Tcl and Tk version 8.0.4.
Since Tcl is extensible, many extension packages
have been written to improves current features and add new ones.
We refer you to
http://www.scriptics.com/
for more information about Tcl.
vmd@ks.uiuc.edu