Power Scheme use at logon

Hi all,

This question relates to a Server 2003 network with XP workstations.

Does anyone know what power scheme is used when a workstation has been turned on, but no one has yet logged on, ie the logon on box is displayed??

As power schemes are set on a per user basis I guess it must be a users settings, but which user ??

Thank you in anticipation,
Steve.