Server push implementation

Hello,
 
I have an application where the server implementation will be EJB and
the client will be a standalone java application. The number of clients
at any point of time will be around 10,000 connecting to the server over
internet. The data exchange between the client and the server is very
high - both pull and server push is possible. What are all the ways to
implement server push mechanism from an EJB?
 
My understanding is:
 
1.      Client can implement an RMI server to which, EJB can make a
call.
2.      Client can run a small web server to which EJB can open URL
through http.
3.      Client can keep polling the server for data.
 
Is there any other standard mechanism / pattern available for these type
of applications?
 
Regards,
-Anand N.

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