Help to develop a communication system..?

hie all gurus..

i wanted to develop an application programs which consist of 3 main important part:

a. it can communicate from a wifi enabled pda to a wifi enabled computer via voip or any other simplest method.

b. it can transfer a picture from a pda to computer.

c. the pda and the phone is connected via ad-hoc.

+ if possible with encryption of data to enhance security..

So, is it possible to program with vb.net? what else should i need to know? what language should i master?

it would be grateful if any of you can guide me on this.. thanks a lot..

btw, i have basic to intermediate knowledge of java, c, c++ and vb..

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