How to configure multiple concurrent sessions?

[cutevnc]

Hi,

How to configure multiple concurrent sessions?
Does the root user have multiple simultaneous logins?
I added a user using adduser command. The screen resolution is too small when i login with this new user. How to correct it?

Thanks

[jsun]

The same user cannot have multiple concurrent sessions.

Multiple users can concurrently log into the machine with individual session.

Can you attach a screenshot about the screen resolution being small?