session object survival after server crash

What does it mean by following statement(ejb2.0 specs Section 6.1) :

Each session object has an identity which, in general, does not survive a crash and restart of the con-tainer,
although a high-end container implementation can mask container and server crashes to a remote client.

What does it mean by surviving after crash and restarting the server ? Is it related to state of a stateful session bean? does the previous state recovered? What happen to enetity beans after the crash???

[ August 28, 2003: Message edited by: Rashmi Tambe ]

What does it mean by surviving after crash and restarting the server ? Is it related to state of a stateful session bean? does the previous state recovered? What happen to enetity beans after the crash???

If the server crashes the state of session bean is lost. The previous state is lost. Entity beans are persistent so survive crashes.

Then what happens in following case?
although a high-end container implementation can mask container and server crashes to a remote client.
when the server starts after cras, does it create the session bean instance in above case?

Use clustering it is possible to survive session bean crashes.
Read this
http://edocs.bea.com/wls/docs61/cluster/object.html#1006807