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Response ID Insertion 
Use this function to insert a response ID in your mail form. This will enable you to monitor customer responses.
When the E-mail is sent out, the response ID is replaced with a GUID identifying the business partner and campaign combination.
In the Interaction Center, the response ID is used to identify the business partner responding to a campaign.
You have created the text node in which the response code is to be included.
Choose Insert ® Response ID to insert the response ID.