2 computers at once?

Hi all,

I've recently purchased the full CC package with the 20+ apps. I know you can use it on 2 computers and I only use it on my laptop. I was wondering am I allowed to use the other license on my desktop computer? I don't see it being an issue but I read somewhere you can use 2 computers but not at once. Can someone please confirm this for me? If I log on and then log on on my desktop and use it at the same time will it lock me out, or is it fine as long as i'm not using more than 2?