2.Large commercial mailers.
3.A user of public transportation.
4.Users and groups own files.
5.1. The number of Chinese-speakers is huge;
6.A resource file, room, eg containing materials for teachers
7.From the regular user command line interface, log in as the superuser.
8.To travel as a commuter.
9.a device designed to provide exercise for the user.
10.Survey and analyze the needs of users.