Transform your regular ASP.NET sessions into distributed sessions without any code change to your existing applications. Download NCache from http://www.alachisoft.com/rp.php?source=/caparea.news2/&dest=/download.html
Regular ASP.NET sessions provide InProc, StateServer, or SqlServer modes. And, if your application is running in a server farm, then all these options have problems including possible loss of session data, low scalability, slow performance, single point of failure, and more.
NCache provides a better alternative to all of this. You can replicate or partition sessions onto multiple servers, keep sessions locally to each web server, create a separate session caching tier, and more.
Read more about NCache Distributed Sessions
http://www.alachisoft.com/rp.php?source=/caparea.news2/&dest=/ncache/ncache_session_overview.html.