Peer-to-peer networks, aka p2p networks, have been around since the birth of the internet. They are created similar to a network with the "ad-hok' architecture where the computers act with each other through a common folder; a "shared" folder. Peer to peer networks are famous for file sharer's exploiting of it to share music and other files. because of the seemingly endless use of p2p networks for illegal actions, these networks are closely monitored for copyright infringement and have landed many people in jail.
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For those of you who do not know what Ad-Hoc is, searching about.com would turn up this answer:
Question: What is Ad-Hoc Mode in Wireless Networking?
Answer: On wireless computer networks, ad-hoc mode is a method for wireless devices to directly communicate with each other. Operating in ad-hoc mode allows all wireless devices within range of each other to discover and communicate in peer-to-peer fashion without involving central access points (including those built in to broadband wireless routers).
To set up an ad-hoc wireless network, each wireless adapter must be configured for ad-hoc mode versus the alternative infrastructure mode. In addition, all wireless adapters on the ad-hoc network must use the same SSID and the same channel number.
An ad-hoc network tends to feature a small group of devices all in very close proximity to each other. Performance suffers as the number of devices grows, and a large ad-hoc network quickly becomes difficult to manage. Ad-hoc networks cannot bridge to wired LANs or to the Internet without installing a special-purpose gateway.
Ad hoc networks make sense when needing to build a small, all-wireless LAN quickly and spend the minimum amount of money on equipment. Ad hoc networks also work well as a temporary fallback mechanism if normally-available infrastructure mode gear (access points or routers) stop functioning.
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