This policy setting specifies the action that Windows takes when a user presses the Start menu Power button.If you enable this policy setting select one of the following actions:-Sleep-Hibernate-Shut downIf you disable this policy or do not configure this policy setting users control this setting.
Policy path:
System\Power Management\Button Settings
Scope:
Machine
Supported on:
Windows Vista only
Registry settings:
HKLM\Software\Policies\Microsoft\Power\PowerSettings\A7066653-8D6C-40A8-910E-A1F54B84C7E5!ACSettingIndex
Filename:
Power.admx