[users@httpd] cross server authentication

["Jason Nesbitt" <jason.nesbitt@xxxxxxxxx>]

My company wants to migrate our existing web applications from 
linux/apache/php|perl|java|etc to windows/IIS/asp.net.  Because we have so many 
applications to port, we'll have to do them one at a time.  Our users currently 
navigate back and forth between many of the different applications and they will 
need to continue to do so without having to login twice for each server.  The 
problem to solve will be how to share authentication information between the two 
servers.  The current method of authentication is Basic over SSL.  Obviously the browser isn't going to send this auth header to a different host.  I'm thinking that I'll have to use apache as the front end to all the web requests and have it forward those with specific paths to the 
asp.net applications on the windows server.  The problem is that I'm not quite sure how to do this.  Can someone point me in the right direction?  Is there a better solution?
Thanks

Jason