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\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.