How to implement traps?

HI all,
i want to imlpement traps on my agent.
I've read that one
methode is to insert in snmpd.conf an instruction like this :"monitor
[options] NAME expression".
for example:
if i want that my snmp agent
alerts me when an Object (OID2) passes beyond a threshold(30), i can
write:
monitor -r 30 -u me -o <OID1> "alert" OID2> 30.

But what can i
do if I want that agent alerts me if the value of an Object (OID2)
specified in a MIB node goes beyond the value of another object(OID1)
defined in the same MIB node?

Thanks to all will answer me

Bye

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