The following attribute-value pairs are optional:
HOST, which identifies the systemwith which the object is related. The combination of HOST, CLASS, and INSTANCE uniquely identify the object.
HOST is required for event reports sent using Operations Sentinel Interface Pipe (spo_pipe), spo_event, or the Event Server API. It is also used if an event report from one systemis used to delete an object associated with another system.
APPL
APPLQUAL