Integrating with ASP.NET sessions and authentication

I was wondering if anyone has integrated a Catalyst application with
ASP.NET session and authentication (for single sign-on if possible).
My company recently go acquired and we've been told to integrate our
systems with theirs (ASP.NET).  I know next to nothing about how .NET
works and was hoping someone had already done the heavy lifting for me
:-).

Cheers,
Rob

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