what kind of zigbee are you using??????? what are its specifications??? does it support serial communication???? if yes the connect it to UART and send and receive data from serial communication....
connect the zigbee modules to 2 different computer serial ports and see if you can send and receive data from each module. if you can do it then you can use it directly....
or you have to configure it as nodes as per your requirement...............
---------- Post added at 14:23 ---------- Previous post was at 14:22 ----------
then you need software to configure it as node and server...