how to transfer information from one router to another router to extend the range of communication network?????

sir i am new in xbee, so how to connect the many routers to the one co-ordinator?
how to identify each routers and co-ordinator?
please help me…

You have to use api mode.In every api packet data it contains the serial no. of xbee from which it comes from.You can set the destination of xbee to send a api packet to a specific xbee.If you want to route the packet then simply set broadcast type as FFFE which stands for routing to all routers.
this link may be helpful Xbee tutorials