Cloud License allows 2 activations http://www.adobe.com/legal/licenses-terms.html
-Install on a 2nd computer http://forums.adobe.com/thread/1452292?tstart=0
-Windows or Mac does not matter... 2 on the same operating system, or 1 on each
-Two activations on one account MAY NOT be in use at the same time (note in the above license link)
Yes you can you can install it on two different units so go! Go! Go!
Install on your desktop and you have used your two free options. IF you want to install on a third unit, either you uninstall from your laptop or you uninstall from your desktop but you can ALWAYS have your programs installed on two different computers. If you want to have three different computers with Lr or Ps, then you have to pay a further subscription. Otherwise, you already paid for two.
Enjoy your subscription and have fun
Thank You for the Info.. Have a good weekend