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Nocuous is absolutely correct.
802.11 wireless LANs can operate in two 'modes'.
Infrastructure mode, where the clients associate with an Access Point. You can think of this as conceptually similiar to a wired hub.
Ad-hoc mode, where two or more "clients" connect to each other directly, without the use of an Access Point.
In ad-hoc mode, all stations must use the same channel and SSID (which is kinda obvious when you think about it). The main disadvantage with ad-hoc mode is that it's a "peer to peer" network; by definition you don't have access to a router or, by implication, the Internet. You could setup one PC with ICS or something similiar, but I've never tried this.
Mr Mephisto
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