Updating the MIDlet application for all the PDA at once.

Good day...
I would like to develop the MIDlet application for my company and i faced the problem as below:
There will be more than ten PDA will be used in our system. The PDA will place on the Ethernet cradle and this cradle will link to the web server to exchanged information. The MIDlet application will install on all the PDA in the first initial stage. How about if i want to change some coding or recompile my MIDlet application, how i can distribute all this updated MIDlet application to every PDA on the network in the efficient way. This is because i cannot install each one by one since this is waste time.
Have anyone can suggest the better idea to me how to solved this problem. Beside that, how i can check on my MIDlet on each PDA is outofdate from the one on the server?? And any opinion on the Ethernet cradle I am using in this case?
At last, if there is possible to update my MIDlet application from time to time, is it this will affect my data stored on the PDA?
Please advice and kindly reply.
Thank in advance...
SL

Not sure on the PDA but on the Siemens Sl45i that I have, you can upgrade the midlet by pressing a button -- provided that the MIDlet URL is set to where the device can download the updated suite. I have not tried it yet, though.

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