Thank you for trying NeoRouter.
If NR server is installed on Linux or Mac, you can log in NR using the same username and password as your operating system. NR will rely on the OS to authenticate user and automatically create a "linked" account in NR database.
For more information, please see this wiki article:
http://neorouter.com/wiki/index.php/Neo ... er#Sign_InYes, NR will maintain the connection for you and you can use other application to access the remote computer. NR will create a virtual LAN among all your computers and you can connect to any computer. NR will also establish direct P2P connection as needed.