Just download the game client and install it on as many PC's as you want. It doesn't check on how many PC's your playing on, just if you're account is logged in (ex. you can only login on 1 PC at a time).
I have the Star Trek Online disk but when i try to install it it wants the key, when i input the key it says its allready being used.
i then tried to download the client but at 96K it would have taken forever to download.
Yeah I installed from my disk on my laptop and did not need to re-enter any code. Your account is really activated online.
For example my brother can run his account on my computer using the same install as mine just enters his account name and pw at the launch.
We can even both log in at the same time on this same computer (each to our own account) of course only one view can be operated with one keyboard at a time. LOL
If I try to run a 2nd instance of my own account - the 2nd one will not open. That is you can't run the same account at the same time - even if you use different computers.