The concept of Program ID is based upon " <b>Publish - Subscribe</b> " of EAI. You actually subscribe the subject on RFC adapter & then RFC connection publish it on the network which is picked up by the right adapter.
That is why you choose the registration type Registered Server Program and in the Program ID field you enter the corresponding program ID from the configuration of the sender RFC adapter.
The selected program ID uniquely describes the RFC sender channel in the configured gateway (Application Server (Gateway) and Application Server Service (Gateway) parameters).
Your XI is the initator of the connection in the case of Sender RFC adapters.
Even though it is R3 that sends data to XI, it is XI that initates the connection between XI and R3 and that is why in the sender RFC adapter you provide the Server Details andthe prgram Id. The connection is identified using the program ID.
When R3 wants to send data it uses the TCP IP Connection in which the program Id is maintained and using this identifies the establised connection and then sends data to XI.
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