i have a XB24-Z7WIT-004....can sum1 plz tell me what are the things required to connect it to a pc???????

XBee & XBee Gateway
2

You need a development board.

You can get one as part of a development kit.

http://www.digi.com/products/wireless-wired-embedded-solutions/zigbee-rf-modules/zigbee-mesh-module/xbee-zb-module#models

You can also get alternative boards from places like SparkFun.

Have a watch of tunnelsup videos on youtube to understand how they would connect together. http://www.youtube.com/watch?v=odekkumB3WQ

Just remember you need two so you have something to connect to.