Purpose: to document the use of another of the [magic names]
in Tcl.

What is its purpose?

What is its format?

What are some good reasons to set it?

* test a package without installing.

What else?

[TCL_LIBRARY]

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[PT] 20-Jul-2004
This environment variable is used to add directories to the Tcl package search path 
(the ''auto_path'' tcl global variable).

I like to keep all my local packages separate from the ActiveTcl installation that I use as a 
base. So I install all additional packages to a ''site-lib'' directory and then set TCLLIBPATH
to this directory path. With this in place a [[package require XYZ]] command will search ActiveTcl 
'''and''' my ''site-lib'' directory for the most recent version of XYZ.

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[Category Tutorial]