Service Control Manager - services.exe
The Windows Service Control Manager (SCM) (SERVICES.EXE) is a remote procedure call (RPC) server that manages creating, deleting, starting and stopping of Windows services. It is started at system boot.
The service functions provide an interface for the following tasks performed by the SCM:
* Maintaining the database of installed services.
* Starting services and driver services either upon system startup or upon demand
* Enumerating installed services and driver services.
* Maintaining status information for running services and driver services.
* Transmitting control requests to running services.
* Locking and unlocking the service database.
For more visit: http://en.wikipedia.org/wiki/Service_Control_Manager
Session Manager Subsystem - smss.exe
Session Manager Subsystem, or smss.exe, is a component of the Microsoft Windows NT operating system, more exactly a system process. It is responsible for Starting winlogon.exe, the Windows logon manager.
For more visit: http://en.wikipedia.org/wiki/Session_Manager_Subsystem
The spooler service is responsible for managing spooled print/fax jobs.
System Idle Process
In Windows NT operating systems, the System Idle Process contains one or more kernel threads which run when no other runnable thread can be scheduled on a CPU. The CPU time consumed by the System Idle Process is commonly of interest for end users, as it is a measure of the CPU utilization in their system which is easily accessible through Windows' Task Manager program.
For more visit:http://en.wikipedia.org/wiki/System_Idle_Process
In computing, Winlogon is the component of Microsoft Windows operating systems that is responsible for handling the secure attention sequence, loading the user profile on logon, and optionally locking the computer when a screensaver is running (requiring another authentication step). Winlogon handles interface functions that are independent of authentication policy.
For more visit: http://en.wikipedia.org/wiki/Winlogon