In the Internet world, you see that computers have names. Individual users also have names. The names are usually given to users when they are given account on a Internet connected computer. Most local area networks require each user to have a name. Most mainframe computers have a similar requirement The user's name is often called a login or userid. Frequently these names are based on the user's actual name, but it is often abbreviated and put only in all lower case letters. A user named "Georgia W. Wilson" might be assigned userids like gwilson or gwwilson. The advantage of this is that if we can combine the userid with the domain name of her system to get a complete address. If Georgia had an account on the klingon computer described above, her complete Internet address would be "gwwilson@klingon.cs.iupui.edu". Other Internet users anywhere in the world could send messages to her by using that address.