Sc.exe is a Service Management Utility in Windows 7. It is a command line program which is primarily used for communicating with the Service Control Manager (SCM) and control Trigger services.
The Windows 7 operating system includes significant improvements to the SCM infrastructure. It is designed to allow services to be started only when they are required (Demand Start) and to help reduce the number of services that use Automatic Start. To realize the vision of having services run only when they are absolutely required.