Thanks, Jason. My R31 doesn't seem to feature this, though.
Models featuring this technology
ThinkPad T23, T30 (R&R 2.0)
ThinkPad T42
ThinkPad T43, T43p
ThinkPad T60, T60p
ThinkPad T61, T61p
ThinkPad R52
ThinkPad R61 (R&R version 4)
ThinkPad Z60m
Thinkpad Z61m
Thinkpad X61, X32