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Controlling 4WD via Xbee wireless

hello..

i only got this item below..

XBee 1mW Wire Antenna x 2
XBee Explorer Dongle x 1
Roboduino Romeo x 1
Xbee Shield For Arduino x 1

i got a question on how to control my 4WD via Xbee wireless?
is it posible? sorry im newbie about all this :)

thanks :)