In SAP version 6.40, the two ways to configure SAP Central Services (SCS) are:
Standalone Enqueue Server – The enqueue server can start and stop independent of the message server.
Combined SCS – In this scenario, the enqueue server and the message server are started and stopped together.
For more information on setting up SPS SCS, see the SAP Installation Guide and the Sun Cluster 3.1 Update 4 Sun Cluster Data Service for SAP Web Application Server Guide for Solaris OS.