Every time an agent chats with a customer, Salesforce automatically creates a visitor record that identifies the customer’s computer.
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Each new visitor is associated with a session key, which Salesforce creates automatically. A session key is a unique ID that is stored in the visitor record and on the visitor's PC as a cookie. If a customer participates in multiple chats, Salesforce uses the session key to link the customer to their visitor record, associating that record to all related chat transcripts.