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> Overview
> The exchange of business documents is known as the process flow. In any TIBCO BusinessConnect process flow, two types of messages are exchanged:

> • | Private messages

> • | Public messages See Managing Services Plug-in Operations.

> About Private Messages
> Private messages are exchanged between a private process and the local TIBCO BusinessConnect installation. Private messages can contain a request, response, or notification document. The private process handles conversion from internal to public data and back.

> • | On the Initiator side, the private process converts internal data to a notification document.

> • | On the Responder side, the private process receives a request and converts it to internal company format.

> You can generate private messages from TIBCO ActiveMatrix BusinessWorks private processes that use the TIBCO BusinessConnect Palette.
> The TIBCO BusinessConnect server has two major roles:

> • | Initiator This role receives request messages from private processes and transmits the Services Plug-in documents to your trading partners.

> • | Responder This role receives Services Plug-in documents from trading partners and submits the converted request messages to their private processes.

> The following sections describe the messages used for private request and response document exchange in the Services Plug-in. The message fields are packaged in the ^data^ control tag as part of the aeRvMsg format.
> See TIBCO BusinessConnect Trading Partner Administration Guide, Chapter 7, Private Process Configuration for more information.

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