Pass parameters from one web site to another without login

[ssingh]

I need to pass username from one intranet website to another.
User logs into one website, if a clicks a link, it should take him to another website, seamlessly i.e. without logging in again.
both websites would be on the same domain.
I do not want to use querystring. Please suggest what would be a good option?

Thanks

[sapator]

If you don't want to use querystring then maybe do a "post"

[ssingh]

I'm looking at this example using POST method in C# though-
http://dashasalo.com/2009/05/23/http-post-in-asp-net/

I haven't tried it yet though, but trying to understand how it works.
Where in here are we specifying the url where we are sending or receiving the params?

[sapator]

WebRequest.Create(URI)