> 
> My friend has linux on his computer.  He can switch between users when in 
> multi-user mode by using the function keys.  In other words, he can sign 
> in as two different users at the same time by using the function keys.  
> Can this be done with MacBSD?  

Why? If he knows both passwords, why bother having two users?
What we can do is log in as one user, start dt, and then su to the
other user(s) in various windows. Command-# switches between the
windows (and thus the users).

Take care,

Bill