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The many features of SPSS are accessible via pull-down menus (see image) or can be programmed with a proprietary 4GL "command syntax language". Command syntax programming has the benefits of reproducibility and handling complex data manipulations and analyses. The pull-down menu interface also generates command syntax, though, by default, this is invisible to the user. Programs can be run interactively, or unattended using the supplied Production Job Facility. Additionally a "macro" language can be used to write command language subroutines and SAX Basic "scripts" can access the information in the data dictionary and manipulate the default output. Scripts will be gradually replaced by the more functional Python programmability extension.