This policy setting allows applications and services to prevent automatic sleep. If you enable this policy setting any application service or device driver prevents Windows from automatically transitioning to sleep after a period of user inactivity. If you disable or do not configure this policy setting applications services or drivers do not prevent Windows from automatically transitioning to sleep. Only user input is used to determine if Windows should automatically sleep.

1. Registry path is:

   HKEY_LOCAL_MACHINE -> Software -> Policies -> Microsoft -> Power -> PowerSettings -> A4B195F5-8225-47D8-8012-9D41369786E2 # ACSettingIndex

2. The Administrative Template path is:

   System -> Power Management -> Sleep Settings

* Making mistakes while changing registry values can affect your system adversely. We recommend you to create a System Restore point before making registry manipulation. If you're new to Registry Editor, read this beginner's guide.

** To locate the registry and administrative template path, checkout beginner's guide.