I will move this to the photoshop installation forum from storage and sharing, but here is what I know:
You can install Photoshop CS6 and activate it on two computers but are only allowed to run it on one at a time.
See applicable links below:
- How Many Computers Can You Install and Run Your Adobe Products On?
....
So, in general, how many systems can you install Adobe software on, including CS5.5 and CS6? The answer for individuals (as opposed to businesses) in most cases is two. The catch is that both computers must be used only by you and the two systems cannot be used at the same time. This policy was designed so that you could run (say) Creative Suite at home on your desktop PC, as well as while travelling with your laptop. But the types of computers and their usage has blurred so much now that you can just pick any two you own and the product should install and properly activate on both.In other words, the primary user may install another copy on a secondary computer for their own use, but the two installations cannot be used simultaneously.