The user interface is what is present between you and your computer. As mentioned above, there are two main types of user interface, the command line, and the GUI. Both the UNIX and DOS operating systems use a command line interface. What the user sees on the screen when they boot up a computer with a command line operating system is called a prompt. The graphics, color scheme, buttons, mouse cursor, and many of the other things you might see on your screen are the user interface. Programs that are written for your machine depend on the user interface as well, so they all might have certain things in common. For example, in modern programs, the loading and saving mechanisms look very common among all the programs in an operating system. Loading a file in Windows 95 looks pretty much the same, whether you are loading a word processor file, a spreadsheet, or a graphic. These programs all look similar because they inherited the interface and file handling capabilities from the operating system.