I honestly have NO idea! but according to the info on my laptop cord you are exactly correct! Well that was easy.
Yes, pretty much all IT equipment is suitable for 100-24Vac 50/60 Hz.
I'm from UK but I travel overseas quite a bit including the US (Mrs B's from there) and my PC and phone usually go with me. And they work just fine.
One of our friends came over to stay with us for a while and brought a voltage converter (AKA transformer) not realising that her phone charger and laptop would here on our nominally 230V supply.
One thing you will need to consider is the plug on the power cord. In UK, this what we have:
Other European countries have different plugs and sockets.
I have a bunch of adaptors that do for most places. You'd probably need your guy to provide them - it might be a bit of a pain to find something in the US to adapt to US style receptacles.
Maybe a simpler solution would be to change his power cords for something like this:
The bit that plugs into the power supply is pretty much universal. Maybe Compaq have a different arrangement but it should still possible to source a suitable power cord locally.