http://www.purl.org/tcl/home/man/tcl8.4/TkCmd/tkvars.html

The above page does not work.  It yields the following message:

"The page you are looking for cannot be found.

Note: The site went through a fairly major overhaul in October, 2005. If you're looking for content that used to be here and can't find it, try using the "Search" box on each page..."
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