Can I use Group Policy to display or remove the Shut Down button on the logon screen?

To start Group Policy Editor (GPE), go to the command prompt and type

gpedit.msc

Expand Computer Configuration, Windows Settings, Security Settings, Local Policies, and select Security Options.

Double-click "Shutdown: Allow system to be shut down without having to log on," configure this setting to either Enabled or Disabled as required, and click OK.

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Exit GPE.

Start the Microsoft Management Console (MMC) Active Directory Users and Computers snap-in (go to Start, Programs, Administrative Tools, Active Directory Users and Computers).

Right-click the container that holds the GPO you want to modify (e.g., a domain, organizational unit--OU), select Properties, select the Group Policy tab, select the actual policy, and click Edit.

Double-click "Shutdown: Allow system to be shut down without having to log on," configure this setting to either Enabled or Disabled as required, and click OK.

Exit MMC.