You may specify a list of items that is provided to the user as a drop-down list or check-box list in dialogs. The values of the list must be specified in a List definition. The List definition is then referenced in the Diagram, Symbol, or Definition where it is being used. Lists must be placed in USRPROPS.TXT before any Diagram, Symbol, or Definition entries that reference them.

Management of the USRPROPS.TXT file is easier if all List definitions are at the top of the file, following any Rename commands.