Loading MIB into ucd-snmp

Hi All! How does one go about loading a new MIB into the ucd-snmp agent (or for any agent) for that matter? We are running HP OpenView and I can load certain MIBs into their MIB Browser and I can see the MIBs there and query specific machines (Windows). However, I cannot query other machines for the specific OIDs, although I *can* read other OIDs. So, my assumption is that the agent is missing the OIDs and thus specific MIBs. So, I need to figure out how to tell the agent to load new MIBs. A shove in the right direction would be greatly appreaciated. Regards, James Mohr