I have the Photography Plan and I love it! Had it fore some years now.
And I've been running it on my desktop and my portable. No problem.
But at the moment I am using 3 systems, two Desktops and my Laptop. (Though the Laptop generally only is used during Travels etc).
So basically there is no problem of doing this, because I can log out the other computers at the I need to use the third (I never use any of these computers at the same time).
So I have two questions:
1. Is it allowed to have it installed on 3 computers, but only use it at one computer at the time?
2. If it is not allowed, do Adobe have any checks on this? So you can do it sometimes but if you do it all the time they will not allow it?