How to Determine What Domain Controller Authenticated the User
A frequent question on the newsgroups is how do I know what domain controller logged me in? To find this out, open a command prompt and type "set logonserver". echo %logonserver% has the same functionality. This is an environment variable so
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Read the complete post at http://briandesmond.com/blog/archive/2006/09/22/How-to-Determine-What-Domain-Controller-Authenticated-the-User.aspx