* makes signs of a cross and puts on his garlic necklace *
XP - yuck! LOL
All the power functions controlled by the OS are managed through the ACPI interface. So that would be where you could look from the OS side of things.
Most m/bs also have power down features in the BIOS settings that are usually independent of the OS. They are usually listed under a menu heading called "Power" on the BIOS settings screen for Award based BIOSes (the "Power" menu being a selection along the top of the screen, along with "Main", "Advanced", and "Boot").
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