The best way to see hroot in action is to try it on our DemoServer, where you have full control over the hroot system.
Please do not change User, Experimenter or Administrator password or limit their permissions. If you do so, the DemoServer can not be accessed until privileges are restored, so you just break things for you and other users. Feel free to try any of the hroot features. If you break something, just come back next day. The database configuration resets every night. Databases are also cleaned every night, so do not expect that your data will stay there forever.