Understanding the Pega-IntSvcs agents
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Five agents in the Pega-IntSvcs RuleSet process queued service and connector requests and perform maintenance for PegaDISTRIBUTION MANAGER (formerly called Correspondence Output Server, or COS). C-2438
PegaDISTRIBUTION Manager is a small, optional Windows server application used to support a Process Commander system for printing and faxing of Microsoft Word documents. PegaDISTRIBUTION Manager can also convert Word documents to Acrobat PDF format.
If your system does not use PegaDISTRIBUTION MANAGER, the checkPrintErrors, checkFaxErrors, and purgeRequestsTable agents do not need to run. To disable them, clear the Enabled? option in those rows on the Schedule tab of every Agent Schedule data instance in your system.
Because these are legacy agents (agents created before V5.4 and not updated to use the Queue Manager infrastructure), if your system does use PegaDISTRIBUTION Manager, enable these agents by selecting the Enabled? option for them on one node only. When enabled, these agent activities interact with the COS database every three minutes to check for errors and purge records from the COS database. (If your application uses PegaDISTRIBUTION MANAGER to convert Word DOC files to PDF format, an agent in the Pega-ProCom agents rule — not the Pega-IntSvcs agents rule — handles the upload and attachment processing.)
Proj-318 5.4 Service requests of any of seven service types can process service requests asynchronously. When configured to do so, EJB, HTTP, Java, JMS, MQ, SOAP and File services use the Queue Manager infrastructure to store service requests as persistent objects in the Process Commander database.
The class, queuing and dequeueing options for the service request are determined by a Service Request Processor data instances. See About Service Request Processor data instances.ABLAL 11/14/08 GRP-500
The first execution of an asynchronous service request occurs in
the service requestor, but in a separate background Thread that
executes after, rather than before, the service response is set.
Queuing and the ProcessServiceQueue agent are used for
the second and subsequent retries, if configured. Queuing also occurs
when configured through a Queue When condition on the
Fault tab or Response tab of the service rule. ABLAL
The ProcessServiceQueue agent is disabled by default. To enable it, select the Enabled? option for it on the Schedule tab of the agent schedule instances (Data-Agent-Queue class).
When the ProcessServiceQueue agent executes a queued service request, the execution is performed with the authorization profile of the service/listener. ABLAL 1/9/09
For more information, see the 
Pega Developer
Network article PRKB-25029 How asynchronous service processing
works.
checkFaxErrors
