J2ee application for mobile,pda

hi all,
I am going to build a web-based application using j2ee. I want my application to be accessiable with mobile and PDA's also. I have heard that few application server supports it and i don't have to change anything weather it is called by mobile or desktop pc.
Can anybody guid me on this issue? How should i proceed?
Thanks in advance
Nitin

Nope, not possible

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