What is a WEBFARM??

I think it's kind of like all servers are working as one. Maybe they have to be in one of these Windows 2000 Advanced Server clusters. They service common applications and share ip address, sessionState etc. However, as mentioned, session state can be shared by several servers only if it is not held within the application process beacuase it won't be available to other servers. Also you've got to run some additonal tools to use shared session state in webfarm. For StateServer it is aspnet_state.exe and for SqlServer it is InstallSqlState