Web Development - capturing userID in a Windows2000 network environment

I am developping a survey on an intranet.  
The network is set up on a Windows2000 platform.  
Each user obviously connects to the network using a login name and a password.  

I want each user to be able to fill in the survey only once.  I need to retrieve the userID of the person when he/she access the survey on the intranet and compare it to a list of userID already created in Microsoft Access.  The Access table would have 2 fields : userID, accessed_flag(empty).  Each time a user would access the form, a command would verify if the "accessed_flag" has been checked.  If no, then it would allow the user to fill the form.  Once done, it would put a check mark in the "accessed_flag" field beside the corresponding userID.  It would also save the form information in an Access table located on a shared server.  If the "accessed_flag" field is checked when a user tries to access the form, then it would allow the user to fill the form but would save the information in a different location, say a trash folder on the same shared server.

The web site uses ASP script.

There should be simple lines of code that can be integrated to the html code to retrieve the userID of the person logged in.  

Which application (Visual Basic, etc) can I use to achieve that, and what is the code to produce the result mentionned above??

Thanks

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