[Chin Huang] observes 
[http://groups.google.com/groups?selm=9njk0e%24210d%241%40news.tht.net]
that [Microsoft]'s [Active Directory] Services Interface (ADSI) 
[http://www.microsoft.com/windows2000/techinfo/howitworks/activedirectory/adsilinks.asp]
exposes a [COM] interface, so it is accessible through such
examples as using [tcom]
======
    # List all users in the domain named "MAIN".
    package require tcom

    set domain "MAIN"
    set collection [::tcom::ref getobject "WinNT://$domain"]
    $collection -set Filter [list "User"]
    ::tcom::foreach item $collection {
        puts [$item Name]
    }
======

[LV] 2009-Sep-15
In the above example, is the domain value a dummy one that one would need to replace when using this in real life? When I try the code literally, I get nothing output.

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Also, [Franco Violi]'s [TclLDirectory] extension is said to understand
ADSI.
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Yet another way to consider Active Directory is as an instance of
[LDAP] service.
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More ADSI-Examples can be found at [Matthias Hoffmann - Tcl-Code-Snippets] (not yet complete but growing...)
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!!!!!!
%| [Category Acronym] | [Category Windows] |%
!!!!!!