The IM-PEP provides features that intercept all interactions between the users’ Instant or Text Massaging client and the Instant Messaging (IM) server. The PEP intercepts each interaction between an IM client and server to determine if the user (sender and receiver) has the appropriate privileges (/authorizations) to perform the requested action. [Source: https://www.omg.org/spec/IEF-RA/1.0/]