Determining the Logged-on User from ASP

If you're using Basic or NT Challenge/Response security for access to your Web site, you can programmatically determine which user is accessing a page at any given time. To do so, simply interrogate the value of the following:

request.serverVariables("LOGON_USER")

Note that, by definition, you'll simply get back an empty string if you're using anonymous security on your Web site.

Source: Jason Fisher
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