This option allows the user to associate selected items with one of four separate Selection Sets. When one of these sets is chosen (has a check mark in front of it), the items that have been associated with it are shown as selected in the network window. To associate items with a selection set, simply choose that set from the Edit menu and then select the items (as explained above) to be associated with it. This feature is used in the Edit Paths mode, when the user draws a path that turns back on itself.