need some clarifyication on the header variable login module

Hi ,

I need some clarification on this Header login Module.

It checks for the Header variable sent by IIS a server, when we implement the single sign on from windows system .

1. Is HEADER variable differnet from HTTP header

2. can we use this login module if we have to check the user id in HTTPheader?

3.In my case the header variable(rEmote_user) will not be set by the IIS as i am not doing the windows authentication. can i set the the header variable(rEMOTE_USER)from asp pages and configure the Header variable login module on the portal to enable single sign on from asp application to the portal?

please write to me if you know anything on this.

Thanks,

Lakshmi