Client-server architecture

• an user can log-in with the same id on the server and all clients machines
• by default, an app runs as a server if not changed from the settings.xml (isClient=1)
• if server, all users are stored on the users.xml file
• if client, the authentication happens on the server machine
• the server must be started in order for the clients to connect and authentication to take place
• tappings are stored locally for clients and server