A method and apparatus for handling a data object accessible by more than one node. A server in a communication network stores information relating to the data object stored at a first node. The server then receives a subscription request message from a second node. This subscription request message subscribes to updates relating to the data object stored at the first node. A copy of the data object is accessible by the second node. The server subsequently receives a publication message relating to a change to the data object stored at the first node and which indicates an identity of the data object and an indication of the changes. The server sends a notification message relating to the change to the data object towards the second node, which is usable by the second node to make corresponding changes to the copy of the data object accessible by the second node.