I'm certainly not saying "information warfare" is impossible--for example, I did some work in the late 70s for DARPA on knocking out satellites with particle beam weapons. Specifically ...

There is an interesting document at http://www.rand.org/publications/electronic/. _Strategic Information Warfare: A New Face of War_, by Roger C. Molander, Andrew S. Riddile, and Peter A. Wilson. -- Llywarch Hen