Peer to peer

Hi all,
Forgive my ignorance, and hope this is the forum for this topic.
Can some-one tell me whether Multiplayer in FS9 uses peer to peer, or is it only added software that is under this banner. The reason for asking is I had a very good internet deal, until recently when fair usage policy was introduced (Tiscali) I use a peice of software call FSInn, connecting to the FSFDT server. This evidently is using P2P. In a nutshell, it was impossible to get on the server until silly times, like after midnight. I am now with BT, have no trouble connecting anytime. However, we have now switched to using a server using the Multiplayer connect in the game (via FS Host). Hence the reason for asking the question.....
I am not quibbing Tiscali's rules etc, just want to know the answer to the technical bit and, basically, what is P2P
I have also just noticed a fair use policy in BT's terms and conditions, so hold my breath on that one.
Many thanks
Forgive my ignorance, and hope this is the forum for this topic.
Can some-one tell me whether Multiplayer in FS9 uses peer to peer, or is it only added software that is under this banner. The reason for asking is I had a very good internet deal, until recently when fair usage policy was introduced (Tiscali) I use a peice of software call FSInn, connecting to the FSFDT server. This evidently is using P2P. In a nutshell, it was impossible to get on the server until silly times, like after midnight. I am now with BT, have no trouble connecting anytime. However, we have now switched to using a server using the Multiplayer connect in the game (via FS Host). Hence the reason for asking the question.....
I am not quibbing Tiscali's rules etc, just want to know the answer to the technical bit and, basically, what is P2P
I have also just noticed a fair use policy in BT's terms and conditions, so hold my breath on that one.
Many thanks