[Hampshire] ACPI - anyone know details?

Hi All.

I've been playing with ACPI tonight - specifically the thermal stuff.

If I cat /proc/acpi/thermal_zone/THRM/temperature, I get a nice, healthy
temperature - that's good.

Trouble is, I don't actually know what temperature this is - is it the
motherboard? CPU? Does it vary? Anyone know how I can find out?

Thanks!

Vic.