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