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Is there a way to programmatically reach into the BIOS and turn on the Wake on LAN capability for those machines that support it?
Ideally, the solution would be cross-BIOS, but hitting each of the major vendors with separate solutions would be okay, too.
BIOS configuration is something that the OS intentionally limits to avoid virus problems (lots of bios viruses back in the day!).
You need to look at the system management interface to see if it’s available generally. You’ll probably need to work in ring0 in windows (or root/kernel in linux). Additionally, you’ll likely need to learn how to do this accessing the hardware directly, learning and keeping a database of the most common BIOS manufacturers and types, and even then won’t be able to cover all of them.