Hi Kasi,
Can you explain more what do you want to configure?
In WebSphere you can configure only two type of singleton services, Cluster Transaction logs or Service Integration Bus (SIB) Message Engine.
pic.dhe.ibm.com/infocenter/wasinfo/v8r0/... A high availability manager provides several features that allow other product components to make themselves highly available. A high availability manager provides: A framework that allows singleton services to make themselves highly available. Examples of singleton services that use this framework include the transaction managers for cluster members, and the default messaging provider, also known as the service integration bus. When to use a high availability manager
pic.dhe.ibm.com/infocenter/wasinfo/v8r0/... or you can develop an application using singleton pattern:
Developing singleton session beans
pic.dhe.ibm.com/infocenter/wasinfo/v8r0/... Regards