If I remember correctly...

Entity Beans could be marked as "reentrant".  Session Beans did not require a 
"reentrant" marking because if Stateless, the container would return another 
separate instance, and Stateful was prohibited (as it is now)...

EJB 2.1 Spec, Final Draft, 7.12.10:

anonymous wrote : The container must ensure that only one thread can be 
executing an instance at any time. If a client
  | request arrives for an instance while the instance is executing another 
request, the container may throw
  | the java.rmi.RemoteException to the second request if the client is a 
remote client, or the
  | javax.ejb.EJBException if the client is a local client.[9]
  | 
  | Note that a session object is intended to support only a single client. 
Therefore, it would be an
  | application error if two clients attempted to invoke the same session 
object.
  | 
  | One implication of this rule is that an application cannot make loopback 
calls to a session bean instance.

S,
ALR

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