Quote Originally Posted by Saevel View Post
As stated by others, you are required to have an installation copy for each platform.

This, however, needs to be clarified.


If you have the Standard Subscription of the game, you can have up to 8 characters per world and 40 characters per service account. You can not log in with any of those characters simultaneously, which is relevant to playing with someone in your household.
You can only log into your account on 1 systems at a time. You can't share your extra characters. Only 1 character can be logged in at a time, whether you have 1 or 40, Can only sign-in and play 1 character per service account. Otherwise you could create mule characters for item storage, if you purchased a 2nd copy of the game, You Can't do it.

If you want to play together with someone in your household you need 2 copies of the game, 2 systems capable of running it and 2 service accounts(which means 2 monthly fee).