how to use 'who' command?

Hi there,

Can anyone please help me out in finding the solution for the below questions?

1) How to list the names of all processes not associated with any terminal?

2) How to list lines 5 - 10 of a file?

3) How to list all possible users working on more than one terminal?

I would be really thankful if someone find solution to the above mentioned questions.

Thank you.
G Ravi Chandran

This is clearly homework. Please repost in the homeowrk forum.