V8ToyTruck,
anti lag works by not allowing the turbo to slow down when you lift off the gas pedal, it does this by using a computer to shoot more petrol into the engine to combust and keep the turbo spinning, this way, there is no drop in power, and the turbo is always spinning, hence no lag.
this is a simplified explanation, they have different methods of implementing anti lag, this is the sound u hear popping and crackling when the cars break for a corner, its the anti lag basically creating tiny explosions in the combustion chamber to keep the turbo spinning. In the early days before anti lag, they would brake with the left feet and keep the right foot on the gas and blip the gas pedal to keep the turbo spinning.
hope this helps
Des