Not everyone uses email regularly though, so then they thought up pop-up and pop-under ads on web sites. As users click from site to site more and more windows open on their screens. Some will even start a seemingly endless cascade where every pop-up window you close seems to open two more.
Recently it occurred to them that they might be missing out on a whole demographic- those who are on the Internet, but don’t use email or surf the web. Thanks to a service enabled by default in all Windows NT, 2000 and XP systems, the marketing geniuses have found a way to easily get their message to these people as well.
What is this service? It is the Windows Messenger Service. The Windows Messenger Service was designed to be a handy utility that System Administrators could use to generate real-time alerts. By having the messages pop up on the screen the System Administrators could be made instantly aware of problems with their network instead of waiting until they wade through their emails or discover the problem some other way.