userhandling

[rembrandt_(_at_)_rootboard_(_dot_)_org]

I have a server and my friend need root-rights but i wont give him my root-password.
Is it possible to add him to a group (like in Win 'Administrator') so that he have the 
needed rights?

I have the follorign groups:

wheel kmem sys tty operator staff guest

I know 'guest' and 'wheel'.
Wheel is for users wich need 'su' (so i understood it).
I add him to 'operator' but he hasn't the needed permissions.


In wich group should I add him?
And what's about the other groups?


mfg. Sebastian :)
*sorry for any english mistakes :) *