All SIC based interactive programs read a initialisation file before starting. This file is a standard command procedure for the corresponding program. For example, for GreG it could contain:
SIC\SYMBOL CL "CLEAR PLOT" ! Short cut to clear the plot SIC\DEFINE DOUBLE SEC/GLOBAL ! SIC\LET SEC PI|180|3600 ! Second in Radian SIC\SIC HELP CONTENT ! Use PostScript file for HELP GTVL\DEVICE ! Prompt for a graphics deviceThe initialisation file is located in your home directory, and its name is ``init.program'' where ``program'' is the default file extension for the application; this is usually just the application name.