Forums mIRC Help question on vop, hop, etc

im using the cyanide-x.net network
in there ~ = founder
& = admin

so does anyone know the difference between ~ and & in abilities? other than the founder has the password to the channel

also, how do i add someone to the list without giving them voice?
can someone with + invite someone else?

how high do u have to be to add someone to the access list?