SNMP, CORBA and XML

[Gayen, Sanjukta, CMDR]

I am trying to understand the application and advantages of multiple
protocols like SNMP, CORBA and XML. I will appreciate a lot if any one can
help me to understand which protocol to choose under what circumstances.  I
am coming across few systems which supports all three interfaces. Can only
one protocol do the job ?

Thanks very much in advance.
Sanjukta Gayen