Let's say you get a patent on something like a pop-up...

Let's say you get a patent on something like a pop-up window. Of course, you could, in theory, go after everyone on the Internet, but you don't. What you end up doing is picking off the weak members of the herd, companies that don't have the money to defend themselves or independent Web sites, or occasionally big companies that you think will not have very much backbone and will quickly settle.