Accessing the Login Information on SPS via ASP .net

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From: Ranjan as usual (usual_at_discussions.microsoft.com)
Date: 06/25/04 

Date: Fri, 25 Jun 2004 13:14:01 -0700

Dear folks,
I'm building an ASP .net page and integrating it into my share point portal server 2003 using a webpage viewing webpart. What I need to do is, when the user logs in, I need to be able to capture the log in information and then find a value called 'row id' based on this log on information. This row id, will then be used to look up his information on our sql server. I can fix the second part of the problem, however the first part is something I have no clue yet. So basically , I need to know a way to find out the log in information , where it is basically stored(and if there are permissions that I'll have to overcome) and how to use it in my program. Any pointers would be greatly appreciated.

cheers,

Ranjan