An entry exists in this table for each document in each job,
no matter what the state of the job is. Each printer is
represented as a separate device entry in the Host Resources
MIB device table as a device of type 'printer', 'scanner', o
'fax', etc. The management station references each job using
the xcmJobIdentifierOnSystem assigned by this (logical
for spooling or physical for non-spooling) device that
accepted the job submission (by some other protocol).