The Publisher API formats incoming market data messages, and forwards those messages to a subscriber. This API is used by feed handlers (Demo Feed Handler and FAST Feed Handler), and developers who want to map proprietary market data into RAP.
An initial installation dialog gives you the option of configuring the Publisher API during the install or later. If you choose to configure the API later, the files are installed, but the configuration settings are left blank. You must manually configure these settings. See Publisher API in the RAP - The Trading Edition Developers Guide.