Does the iOS 4.2 rotation/orientation lock offer portrait and landscape locking?

Though the physical rotation lock switch was changed to a mute switch with the iOS 4.2 update, locking the rotation on your iPad via the dock rotation lock switch still offers both portrait and landscape locking.

The rotation/orientation lock in the dock will lock the iPad in whatever its current orientation is at the time the lock is employed.

This is unlike the iPhone, which only offers portrait orientation locking.