SAYMON API allows to add properties with any integer type_id. In some projects or extensions you may wish to use your own ids to group information or implement specific cases. So to preserve any conflicts we reserved first 100 type ids for the future needs of SAYMON, while you can use your own ids starting with 101'th value. User Specified Property is handled by SAYMON UI in the same way it handles Info Property - displays it in Properties section.