It will work like any wireless connection that would be included in your machine. The only way you have access, is if the connection being available is unsecured or open to anyone. If it is secured you will require a password. Otherwise it is the same as you would experience with a built in wireless.
my new dell inspiron 6400 does not include wireless. if i buy a wireless pci card can i use it for hot spot and roving access on my travels in the US and Europe?