There are two types of processing a plug-in can do:

• Pre-process an HTTP request coming to the WebFOCUS Client from the browser. Examples of this type of processing include blocking requests to the WFServlet based on HTTP header information, manipulating HTTP request information, or setting variables.
• Pre-process a report request being sent by the WebFOCUS Client to the WebFOCUS Reporting Server and/or post-process the output being returned by the Reporting Server. Examples of this type of processing include adding selection criteria or other logic to the WebFOCUS report procedure or parsing the report request and answer set for bi-directional strings (left/right versus right/left strings). This type of processing is referred to as TRANSINOUT processing.

Plug-ins are implemented as java classes identified by a WebFOCUS scripting variable.