I also want to interface with the Processing programming language. Is this possible?
Bump - more help please
What research have you done?
What type of wireless transceiving are you looking to use and what is the range you are wanting to go? Wifi, Bluetooth, RF, IR or GSM, GPRS and SMS, are your best bets to send a wireless signal, even smoke signals and carrier pigeons are technically wireless means of communication too 
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Im not sure if Processing supports Wifi or ethernet as I don't use it, but its something you can look into. But I do know it uses a serial connection so Bluetooth is an option.
You got to do some homework and see what you are willing to do and how far you are willing to go to do it.