Getting the user's windows Id for a web page

Hello,
Here is my problem.  I have .net web project that is used both internally and externally.  I'm building a page that is only going to be available internally on the site.  When the user goes to that page, I want to capture their windows login id.  I'm going to use IP address to restrict access to the page.  Now the site does have a login screen (and unfortnately I've inherited) but all the internal users use the same login access because a predicessor didn't want to have to handle granting individual accesses for the internal people.
So how can I (for this single page) get the user's Id but leave the other pages in the site not care about the login credentials?
Does this make sense?
And please don't answer with "force everyone to use individual logins", I tried to get that to happen and was shot down.
One last requirement, the .Net code (if applicable) that gets posted, please be in vb.net (not C#).
Thanks.
KakoroatAsked:
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David Johnson, CD, MVPConnect With a Mentor OwnerCommented:
You can't get any more information from the user than what the user presents to you.
since they all use the same logon -- you can't get anymore user information, but you do get the users ip address you can give internal users access i.e. their ip is in the range of 192.168.0.0 -> 192.168.254.254 but external users you're out of  luck for company users getting access to that page.
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KakoroatAuthor Commented:
Went a different route, so I'm killing the question.
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