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Vncserver runs as the user who starts it. So if you start it as root, you'll only be able to access as root. If you start it as a normal user, you'll access it as a normal user. If multiple users start their own vncserver, each one is assigned a different monitor. So the first is :1, the second is :2 ..... and those correspond to the port 5901 and 5902.
Ah. That's a different problem entirely. You'll have to do a bit of research on su and sudoers. Su is the command that lets you run a program as another user. If I remember correctly, if you call su from root (like you would on boot), you don't need to supply the password to run a program as a regular user.
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