Hello,
As far as i am aware you can install on one desktop and one portable, but both copies cannot be run simultaneously.
I have an educational license of Adobe Production Premium and I have it installed on my Mac Pro and my MBP.
I very rarely use them simultaneously, perhpas only when im using the Mac Pro to render video i will use photoshop on the MBP.
The simple work around to running them at the same time is to turn off the network connection on one of the sytems (unplug ethernet or turn off wifi) so that the software cannot detect that the same license is running elsewhere on the network.
Hope this helps.