Three, not sure what you are referring to there, but there was no mention of wi-fi via dial-up.... He said that they have 2 desktops, with dialup, because they cannot get a broadband connection at their location. The built in wireless he is talking about is the laptops internal wireless capabilities.
Geekster.... YES, if the laptops have wireless set up, and you find a Hotspot, then you can indeed use the internet there. Some large cities have hotspots, and also some stores like Starbucks have hotspots as well. many times, these are free, and you do not have to pay. It doesn't matter who your HOME ISP is, you would be using a totally different connection.
When I took my girlfriend down to Florida 2 months ago, the resort we stayed at was in a Wi-Fi hotspot, and we were able to get online for free.