Absolute LoJack, with windows. It installs itself as a windows driver before/during the boot. It sends location once a day, or more often if you flag the device

Absolute LoJack, with windows. It installs itself as a windows driver before/during the boot. It sends location once a day, or more often if you flag the device as stolen/missing. It can also remotely "brick" the device (yes, it can be undone by the owner) if the data is of concern. I deliberately did not set BIOS password so that the laptop remained usable to whomever got their hands on it.