callback routines

while going through the netsnmp code i found that once the daemon receives a
packet it generates the corresponding pdu which is then passed to the
callback routine for this session.
What are these callback routines. Are they responsible for generating
response pdu's. I was looking for functions which generate response pdu's
and then response packets but i am not able to locate it in the snmp code. I
will be really grateful if someone could point to the relevant part of the
code where these request pdu's are handled and the response pdu's are
generated.
best regards

devvrat

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