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two way communication

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I face the same problem that cindy sung asked in August 6, "Now I am designing an infrastructure for PDA application. The basic use case is that the employees need to communicate with the manager about the sales information. So, the employees should be able to both send and receive information to/from the server. How can I do it?
I don't think it should be a Servlet based achitecture, since then the client won't be able to be informed by the manager of any urgent things at any time he wants to. So, for a active two-way communication, I am thinking whether RMI can do this."
But RMI needs 2.5M ROM and 1M RAM which is not suitable for MIDP devices. If I want to implement two way communication between the server and the MIDP device, how can I do?
Thanks a lot!!
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