In COPE we implement interception by using OrbixWeb filters. OrbixWeb is an implementation of CORBA by IONA Technologies Inc. It is compliant with the Object Management Group's (OMG) CORBA specification Version 2.0 and is implemented in Java. It provides a filtering mechanism with support for piggybacking of additional information onto method invocations. There are two types of filters in OrbixWeb: per-process and per-object filters. We describe both types in turn.