#2 ICS - Just to be clear this more about using a duality mode of the same Wireless Adapter, allowing it to connect to a WiFi spot and then create an AP/ICS at the same time. This is what makes this beyond ICS. In the past you would need two WiFi adapters to do this with ICS or a dual AP/WiFi card as I mention above that did ship in a lot of laptops.
#3 ICS has been around since Win98, and NT4.0 - also other features like bridges and multiplexing connections. Back in the days of dial-up these were life savers for people with one phone line and also businesses without access to highspeed or a fall back to dial-up where you could use 2 or more modems to create a larger bandwidth connection. Windows has had a lot of connectivity features from the NT4.0 and Win98 days, and is one of the reason Win98 was more than just an 'update' from Win95. (Win98 also introduced OS level sound mixing -playing more than one sound at a time - and a lot of other 'nice' little features that people in the Windows world just take for granted.)
#5 Go look at Alltel/Verizon, if you have a 3G phone, Tether it, and pay the $25 a month for virtually unlimited Internet access. ATT is one of the more expensive 3G broadband plans and a really poor example to use if you want cost effective easy 3G. (There is even chaper 4G in many cities now.)
#6 Um, not really... ICS is a very strong and reliable NAT solution, that is just as functional as any home NAT based router. Also this is just turning on ICS for the WiFI virtual adapter, so unless your iPhone has a magical VPN application that is somehow incompatible with NAT, you won't see this.
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