Mr Sanderson I have mine installed on both my main computer and laptop both work very well and I believe you can install these on up to three computers for personal use, hope this is of some use to you
if it's like Photoshop CS5 you get umpteen installs, but only two can be activated at the same time. And Adobe, being the nice people they are, insist that both installs must not be used at the same time. If you take an install off a computer be sure to deactivate it first - that way the Adobe servers record that you have one install in hand. If your computer's hard disk dies, phone Adobe and they will restore your account to give you back the install you lost with the hard disk's failure. I've done this and found them more helpful than I'd expected.