AWD is the new marketing term for 4wd cars that are not intended to go off road.
AWD is 4WD and vice versa.
Here in Australia we call AWD cars "soft-roaders".
As opposed to 4WD cars being "off-roaders".
Subaru WRX or Liberty (Legacy) are also AWD, with not intention whatsoever of going off road. The AWD is for safe handling.
AWD may be used to denote constant 4WD, as Hummers are. We can not disconnect the front drive.
4HI is just a constant 4WD with all diffs open. Any split in torque front-rear would only be relevant on bitumen. In extremely slippery conditions the car would become only a 1WD = one wheel drive, as torque finds the path of least resistance.
4HI locked means that the centre diff is locked => torque is always split 50% front and 50% rear. With front and rear diffs open, in extremely slippery conditions the car becomes a 2WD (one of the front wheels and one of the rear wheels).
4Lo is same as 4Hi , only the ratio of transfer case changes.
4Lo Locked + rear diff lock turns the car into a 3WD.
4Lo Locked + rear locker + front locker finally gives you a true 4WD ! Where all 4 wheels always get driven.
Wonder if anybody will bother reading this ?