Advise on Ghost 15

I have 3 identical computer system all running Win XP Pro. I want to copy the entire C Drive  from system 1, so that I can duplicate it on the other 2 computer systems. I bought a Ghost 15 last week and installed it in System 1. After successfully copied the entire C Drive to an external USB  Hard Drive, I got stuck. How should I proceed from there.

 

Please advise. Do I need to install the Ghost 15 in my the other 2 computer in order for me to copy from the external USB Hard Drive? I read somewhere that say that I must run DOS command in my the other 2 computers in order to copy from the external Hard Drive to the other 2 system. Is it true? I am not sure about DOS.