A shorthand for [incr Tk].

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A list of the commands added by this extension:

   * itk::usual

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"ITK" is also an acronym for the US 
National Library of Medicine's
[http://www.nlm.nih.gov/]
open-source software, "Insight Segmentation and Registration Toolkit"
[http://www.itk.org].  This package supports the Visible Human Project
[http://www.nlm.nih.gov/research/visible/visible_human.html].

There's a high-quality binding of (this) ITK to Tcl.
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[Category Package], dependant on [incr Tcl].