Session State
This is a special case of the cookies discussion we covered elsewhere. At a technical level, a user session
is maintained by using a cookie on the client machine to maintain user identity. You can think of this as a
number that uniquely identifies that user. When the user visits a new page, the web server can retrieve
this cookie (from the client) and look up the information it stored about the user when he visited other pages on the site.
At time of writing none of the major search engine crawlers handle cookies and session state.
This means that - if you want the crawlers to index your site - you must make it
accessable without session.
The exception here would be areas of your site which you are not interested in having indexed by
the search engines....a shopping cart might be an example.
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