VALUE = g_config (NAME, [, NEW_VALUE]) - Get/set settings of g_XYZ functions NAME can be one of "gnuplot_version" : Gnuplot version, e.g. [MAJOR, MINOR, PATCHLEVEL] This parameter cannot be set. "gnuplot_program" : Gnuplot program that is called in g_plot() Default is "gnuplot" "eps_viewer" and "png_viewer" : Programs called to view eps or png plots. Defaults are "gv" and "eog".