That might well explain why the keys felt less like springboards, and more like trap doors.

ENGADGET: Fingers-on with Synaptics' ThinTouch keyboard for Ultrabooks (video)

In fact, some security firms told a Senate Committee of finding hidden "trap doors" left behind by contractors and there is no way to know if they were left for benign or malicious reasons.

CNN: Senate report: Nation at risk of Y2K-related terrorism