DAOGREY, DAOPLOT and DAOCURS have been specially tailored round each other. DAOPLOT and DAOCURS will not at present work on an image displayed with any routine other than DAOGREY. DAOGREY uses the AGI database system (SUN/48) to record the position of the image on the screen. DAOPLOT and DAOCURS use the database file to set up the screen coordinates. When an entire session has been completed the database file can be deleted.