When you connect to a cluster, a new cluster definition is added to your HAM view. Information about new cluster connections can be saved locally so that next time you start HAM, the cluster definition is available for you. To save the changes you made by adding or removing cluster definitions, click this button. If you connect to a cluster and then choose not to save the view upon exiting HAM, the next time you open the HAM application on the same computer; it will not have the cluster definition you added.