Novell Messenger does not require the existence of a GroupWise system in your Novell cluster, but presumably one has already been set up as described in Section 21.0, Planning GroupWise in a Windows Cluster and Section 22.0, Setting Up a Domain and Post Office in a Windows Cluster. As part of the process of setting up GroupWise in your cluster, you filled out the System Clustering Worksheet. Some of the information from this worksheet will be helpful as you implement Messenger in your cluster.