The menu system in Asterix allows a user to fire off a task by "pressing" a "button" on the screen with the cursor. A menu consists of a set of up to 10 buttons, and may be set up interactively using the DEFMENU command or by calling up a pre-defined menu file with the command, LOADMENU. Up to 5 menus may be defined simultaneously. A previously defined menu may be activated by the command "RUNMENU n", where n is the menu number.
To get a feel for how the menu system works, start up the image processing system on an interactive graphics device and try out the default image processing menu, using the following sequence.
Menu files may be written by the user, see the help entry on 2_File_Format.ICL> IDISPLAY image_file ICL> LOADMENU $AST_DAT_MENU/img.mnu ICL> RUNMENU 1
A single button may be defined to do several tasks, see the help entry on 1_Buttons.