Side Effects Software [http://www.sidefx.com/] is a company specialized in visual effects and animation 
solution for video and film production.

Its main software (Houdini) has ability to combine its internal scripting language (hscript) with Tcl-Tk,
enabling the user to create GUI to interact with it.
See an example here [http://www.lewkiw.com/html/global.html].


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