I've moved my S-Control to a server hosted internally and I can place all the values I need in the querystring, rip them out, format the page accordingly and let the user have at it.  Now, how do I get them back to the original quote they came from?  I can't seem to find much documentation on retURL when it comes to externally hosted S-Controls.

Can I develop S-Controls using C# as back-end code or am I restricted to JavaScript?

I've moved my S-Control to a server hosted internally and I can place all the values I need in the querystring, rip them out, format the page accordingly and let the user have at it.  Now, how do I get them back to the original quote they came from?  I can't seem to find much documentation on retURL when it comes to externally hosted S-Controls.