http://forum1.netgear.com/showthread.php?t=3301 this is how to set the router up as a switch/access point.
here is ICS on newer windows
http://windows.microsoft.com/en-gb/w...ection-sharing
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here it is for xp
http://support.microsoft.com/kb/306126
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you used to have to use a crossover cable but nowadays they should work auto ( well routers and switches can sense nowadays not sure if you PC nic will or not )
Ive not done anything adhoc for years