.NET to SAP - SSO Question

Hi,

I am trying to implement SSO from our existing .NET application to SAP Portal 6.0.

The .Net app uses forms authetication to logon users, I was told that setting a header variable in the .NET app and configuring EP to read the header variable on form POST should do the trick. Is this true? If not, what are the steps to do this?

Thanks

Pritam J