In order to use a security plug-in, you need to register the security plug-in with the Oracle Tuxedo system. The registry of the Oracle Tuxedo system is a disk-based repository for storing information related to the security plug-ins. Initially, this registry holds information about the default security plug-ins. Additional entries are made to the registry as custom security plug-ins are added to the Oracle Tuxedo system. The registry entry for a security plug-in is a set of binary files that stores information about the plug-in. There is one registry per Oracle Tuxedo installation. Every client application, server application, and server machine in a particular CORBA application must use the same set of security plug-ins.