From news:comp.lang.tcl, message 3C34901B.D7F59612@san.rr.com  ,
[Darren New] writes on how to enable one to use Tcl CGI scripts:

Go to the Internet Information Services console. (Under "Administrative
Tools" perhaps.) Open the "Default Web Site" thing, and find "Scripts"
under there (or whatever dir you want the CGI dir to be). Right-click on
"Scripts" and pick "Properties". The first tab is "Virtual Directory."
Near the bottom is "Configuration" and "Execute Permissions". Set
"Execute Permissions" to "scripts only" or "scripts and executables".
Click "Configuration" and go to the "App Mappings" tab. Say "Add" and
fill in 
   C:\TCL\BIN\Tclsh83.exe "%s" 
(Or wherever the interpreter is).

Pick an extension. I use ".tsh" (without the quotes) for "Tcl Shell", as
opposed to a Wish program. Pick whatever you like.

If you don't put the "%s" there, tclsh83 doesn't get the name of the
script to run. Wonderfully undocumented. Click "Script Engine". Set the
verbs if you want. Click "check that file exists" if you want. 

http://localhost/Scripts/xyz.tsh will now invoke xyz.tsh in a tclsh83
interpreter with everything set up for CGI.

Hope this is what you're looking for. The basic answer is to go to "App
Mappings" for a script directory and associate ".tcl" with tclsh83.exe
"%s".
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Another frequent request deals with using Tcl as a scripting language alternative to [Visual Basic] on the server side.  To enable Tcl as a
server side scripting language in IIS, one
must install a Tcl [Active Script] engine.
See [TclScript] and [tcom] which provide experimental implementations.
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[TclControl] and [TCLBridge] might also be useful.
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Doesn't perl from [ActiveState] automatically enable perlscript in IIS?
If so, why can't ActiveState do the same for tcl?

[JH]: It is possible, but we wouldn't want to do it without someone in the community fully testing that it works.  If someone wishes to do that, we would certainly consider adding this as an install option.
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When installing wikit under IIS I found out that at least my version of IIS did not support PATH_INFO variable which is essential for wikit application. This could be fixed by issuing the following administration commands:

  C:\>cd \inetpub\adminscripts
  C:\Inetpub\AdminScripts>adsutil set w3svc/AllowPathInfoForScriptMappings True

More info at MS site http://support.microsoft.com/default.aspx?scid=kb;en-us;184320

[Roy Nurmi]