The software product ID of the SNMP sub-agent which implements
the XCMI Comms Engine MIB on this host system.
Usage: This object SHALL specify the software product ID of an
SNMP sub-agent (possibly also found in a conceptual row in the
'hrSWRunTable' and/or 'hrSWInstalledTable' in the IETF HR MIB).
This object SHALL NOT specify a particular release of the XCMI
Comms Engine MIB, or the whole host system product.
Note: Contrast with 'sysObjectID' for the whole SNMP agent in
the IETF MIB-II (RFC 1213) and 'hrDeviceID' for the whole device
(or whole product, in the case of 'xcmHrDevice...') in the IETF
Host Resources MIB (RFC 2790).