This chapter describes the ways to start instances of MetaEdit+ by utilizing the command line parameters and operations. The main intention of command line parameters is to support MetaEdit+ working as part of an automated build or maintenance. The basic pattern for such tasks is to first login to MetaEdit+, execute a set of commands (e.g. running generators) and then logout. While some command line parameters are available in the Modeler version of MetaEdit+, most of them require the API or Workbench version.