SCM is Windows Service Control Manager. Its responsibilities are as follows:
o Accepts requests to install and uninstall Windows services from the Windows service database.
o To start Windows services either on system startup or requested by the user.
o To enumerate installed Windows services.
o To maintain status information for currently running Windows services.
o To transmit control messages (such as Start, Stop, Pause, and Continue) to available Windows services.
o To lock/unlock Windows service database.