you can install poser 5 on as many computers as you have. You can only run one copy at a time. if the computers are networked then it checks to see if the other copy of poser is running and will not allow you to run the second copy without a different licence. example, if you had a desktop and a laptop, you could install poser5 on each, and you are only supposed to run 1 copy at a time, if you need to run both at the same time say rendering on one and posing a scene on another, then you are required by the licencing agreement to purchase a second copy. hope that helps. (not a CL person, just read over and over this question before).