All editing systems are now nonlinear computer-based systems that allow random access to any video shot or scene without having to fast forward or fast reverse to find it. Nonlinear systems can create a range of special effects, such as slow motion, wipes and dissolves. Another highlight of a digital nonlinear system is its random access process that makes it easy for an editor to find desired shots or scenes without having to spend time fast forwarding or rewinding videotape. With nonlinear editing, shots or scenes can be easily added or removed anywhere in the program, and the computer adjusts the program length automatically. Linear editing was like composing a paper on a typewriter. If a mistake was made or new information needed to be added the whole piece had to be retyped. Nonlinear editing, on the other hand, is like using a word processing program. If a mistake is made, it is easily deleted and fixed with a few keystrokes, and new information can be added easily.