You can also store an object instance in the Session object, although doing so can affect server performance. For more information, see Setting Object Scope . Managing Sessions for Web Farms ASP session information is stored on the Web server. A browser must request pages from the same Web server for scripts to access session information. Instead, special software distributes all requests for the site URL to whichever server is free, a process called load balancing .
Load balancing makes it difficult to maintain session information on a Web farm.
To use ASP session management on a load-balanced site, you must ensure that all requests within a user session are directed to the same Web server. If all links in your application pages are relative, future requests for a page will be routed to the same server. ASP creates a new user session on that server. The browser will request the specified page, and all subsequent requests will be routed to the same server. Cookies A cookie is a token that the Web server embeds in a user's Web browser to identify the user.