The 'icon' property

An integer scalar

Valid for: Icon

The icon property determines the icon that displays. It is an integer scalar which corresponds to the ID of the icon. Standard values which are built into the system are:

        0          Stop icon
        1          Alert icon
        2          Note icon
        3          Question icon

Under MacOS, you can also create your own icons using a standard tool such as ResEdit, in which case you allocate the resource ID number. When you set this property, APLX looks in the resource fork of the APL program, and then in the system file, to find the icon, looking first for a color icon of type 'cicn', and, if it does not find one, looking for a monochrome icon of type ICON.