The Service Manager is a service that manages all domain operations. It runs within Informatica Services. It runs as a service on Windows . When you start Informatica Services, you start the Service Manager. The Service Manager runs on each node. If the Service Manager is not running, the node is not available.
The Service Manager runs on all nodes in the domain to support the application services and the domain:
Application Services: Application services represent PowerCenter server-based functionality. Here are some application services in Informatica Power Center.