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Ad Hoc Networking
An Ad Hoc network is a decentralized type of wireless network that does not use a router or established wireless base.
"Ad Hoc" is the Latin term for "for this purpose."
Networks can be easily created with an Ethernet crossover cable, or using internal/external wireless cards. Ad Hoc networks are mainly used for file transfers between small groups.
Ad Hocs are basically just temporary versions of LANs.