Let me give you an example, in some MMOs, there 'servers' where they separate you from other players. Let me give you an example.
In a game where it says Server #1, Server #2 and Server #3. Usually MMOs create servers to divide the player count, for example, if you had 1000 players in Server 1, and 5 players in Served 2, basically the job of having separate servers is to equalize all servers together, like having 300 players in server 1, 300 in server 2 and 300 in server 3.
On Graal, we don't have that system, what we have is a PC Client. This client will log you in to a server called 'Login'. This server will 'link' you to other servers.
What this means, when you login on Graal PC Client, it will ask you to join a server. (One thing, every server has it's own scripts, weapons and players, they are not linked together)
So when you choose a server called Era, it will log you in to the server, it will run all scripts in the server, it's like you're playing a game called 'Era' and not Graal.
Same concept in another server called Zodiac, Classic or whatever you can find in there.
What gold gives you is the privilege of having access to the remote control of the server (where the weapons, scripts, classes, DBs and everything is stored) IF you are staff in the server... IF you're staff and DO NOT have Gold Membership, you cannot access RC, IF you're NOT staff but you have Gold Membership, you CANNOT access RC.