The programs in the QTL Cartographer suite all have the same look and feel and are heavily influenced by UNIX programs. They can be used as command line programs, or in an interactive mode where a menu of options is presented. Some command line options that are common to all the programs are discussed in 1.6.1. The new user should become familiar with these options. In addition to the command line interface, all the programs have an interactive menu for setting options. The user need only start up any program in the suite and a list of options will appear. Selecting the number of an option will allow the user to change the value of the option. When all options are set to the user's satisfaction, choosing a zero `0' will cause the program to run. Choosing the penultimate numbered option will allow you to exit the program without changing any files. The last option saves any parameters you have set before exiting.