Exit Modules publish completed certificates through any number of transports or protocols. By default, the server notifies each exit module installed on the server whenever a certificate is published.
A Component Object Model (COM) interface for writing custom exit modules for different transports/protocols or custom delivery options is provided with Microsoft® Certificate Server. For example, an LDAP exit module might be used to publish only client certificates in a Directory Service and not server certificates. In this case, the exit module can use the COM interface to determine the type of certificate that the server is issuing and filter out any that are not client certificates.