Command files can be used to perform many different tasks. A command file can be written for batch type processing; that is, the command file can load a number of different data series into an existing Worksheet and print or save results. In this case, there is no need for user interaction. Other command file applications may require user interaction. Command files can display messages, prompt the user with yes/no questions, and present menus so that the user can make decisions about steps in the command file and control aspects of the automated analysis. The sections below discuss options for user interaction with command files.