Side note: because of the fixes in the latest revisions it is very important to update snmpcollector and pollagent to 2.26 or later when there is another update.
System Object ID is plain english for the sysObjectID OID which is a unique identifier for the particular type of device.
tech head version:
1.3.6.1.2.1.1.2 - sysObjectID
Generated from OBJECT-TYPE definition found in rfc1213-mib2.asn1
OID value: 1.3.6.1.2.1.1.2
OID description:
sysObjectID OBJECT-TYPE SYNTAX OBJECT IDENTIFIER ACCESS read-only STATUS mandatory DESCRIPTION "The vendor's authoritative identification of the network management subsystem contained in the entity. This value is allocated within the SMI enterprises subtree (1.3.6.1.4.1) and provides an easy and unambiguous means for determining `what kind of box' is being managed. For example, if vendor `Flintstones, Inc.' was assigned the subtree 1.3.6.1.4.1.4242, it could assign the identifier 1.3.6.1.4.1.4242.1.1 to its `Fred Router'." ::= { system 2 }
User Defined Property 1: is just that, something you want to add to the device for some reason. It could identify the device as having a special configuration, part of a special group, or whatever.