Xbee communication with multinodes with QoS

Hi everyone,
I am a student pursuing Engineering.I found the Xbee communication interesting to work on.Please some one help me get started and guide me.

I would like to make one Xbee as the coordinator and have the other Xbee nodes transmit the sensor information to the coordinator.

My question is it possible to view the sensors' real-time data (i.e) can i view many data simultaneously? If yes,then how can i control congestion and how to maintain the Qos?

I would like to mention again that i am a student and i would be glad if some one kindly guide me from the scratch.

I would like to make one Xbee as the coordinator and have the other Xbee nodes transmit the sensor information to the coordinator.

Not a problem. What sensor information?

My question is it possible to view the sensors' real-time data

View the data on what? It is possible for the coordinator to collect the router/end node data in real-time.

can i view many data simultaneously?

Depends to some extent on how you define "many". 10? Probably. 1000? Probably not. Also depends on what you mean by viewing the data.

If yes,then how can i control congestion and how to maintain the Qos?

The XBees manage congestion by retransmitting data that is not acknowledged. What is Qos?