Bypassing USM for internal requests.

Hey,
 
I would like to bypass the USM model for local applications' requests.
Meaning that I'd like applications on the local machine (running the
Master agent), to be able to access MIB objects (using SNMP get/set),
but without USM authentication or authorization.
 
1) How can I create a session (which the master agent listens on)
without USM/VACM? (any guidelines would be appreciated)
    1a) Can the authentocator field in the snmp_session structure help
here in any way? (what does it do?)
 
thanks,
Erez Makavy