In most cases, it's best to provide many different options. Some people like to read off the screen, while others prefer printed directions. The advantage of web-based instruction is that the developer can incorporate interactive aspects such as links to other websites, practice activities, and color. If you place the instructions on the Internet, people everywhere can benefit. See TechTV Guides for examples of web-based tutorials.
Many people prefer reading from paper.
They can take notes on the document and file it for later use. In addition, they can learn an application without switching between the tutorial page and the application screen. Learn more about Adobe Acrobat and how to create PDF files. Check out the Land Grants project for an example. Before writing a set of instructions, explore the online resources already available.