TREX Instances and the TREX System 

A TREX instance is an administrative unit that comprises the TREX server components. A TREX instance is started and stopped as a unit.

The following components belong to a TREX instance.

·        A name server

·        A queue server

·        One or more index servers

·        One or more preprocessors

·        Optionally, one or more RFC servers

·        Optionally, one or more Web servers

A TREX instance runs on a host. It is possible for several TREX instances to run on the same host. A TREX instance is identified by a two-character instance number. This instance number must be unique on a host.

A TREX system consists of one or more TREX instances. If it consists of only one TREX instance, it is called a single host system. If it consists of multiple connected TREX instances, it is called a distributed system.