Two quick notes...
Players have their own accounts. GMs will manage which players have access to their realms on an individual basis, so a GM could invite one set of players to Realm#1 and a different set of players to Realm#2. Or the two groups could overlap. A player can also participate in realms of different GMs.
Web-based player access is going to start coming online late this year - at the earliest. The Player Edition provides all the same capabilities that you have as a GM, except that the user can't edit anything. Players can view everything that's been revealed, navigate through it, filter it, etc. In contract, the web-based interface will start out very limited in functionality and grow over time, so there will be a significant difference in capabilities between the two when web-based access first comes online. The key advantages of the web-based interface will be that it can run on any device via the browser and it will be free.
Hope this clears up any uncertainty!
