Shoutbox visable to certian groups only?

[ArchPrime]

Hi - I am basing my group IDs on the order in which they are listed by default in AdminCP/Users and Groups/Groups.  

So I am assuming "1" would be Guests, "2" would be Registered users , "3" would be Super Moderators .. etc

If wrong, are the correct IDs listed anywhere?  I have not been able to find a complete list explicitly relating group number  to group  name anywhere.

I also did not realize I was hiding content this way !  What should the script be to instead reveal {$shoutbox} to only groups 2,3,4 & 6 ?

Cheers