It is possible when you work with SNMP to config a Trap manager that will manage all the change requests, you can listen to the traps while they are sent (by sinifing UDP).
For example if i have a tarp manager then every "SET Request" i will send i will see a trap sent from the SNMP Manager to the trap manger that will indicate that there is a change request.
Anyhow i found in the SNMP Toolkit something that helped me.
Thanks anyway!