27. The system of claim 26 , wherein the operations further comprise determining visibility of the connection.
27. The system of claim 26 , wherein the operations further comprise determining visibility of the connection. 29. The system of claim 27 , wherein operations of following the connection comprise: determining whether the connection comprises a copy version identifier indicating a latest version of the target instance token that is accessible; determining whether the target instance token is visible based on the copy version identifier; and processing the target instance token based on a successful determination of visibility.