Use this dialog box to assign a security filter to users or groups. You can assign only one filter per database to a user or a group:
Assigned Users and Groups—Users and groups to which a filter is currently assigned.
Available Users and Groups—Users and groups to which you can assign a filter.
Single-arrow—Moves selected items from one list to the other, in the direction indicated.
Double-arrow—Moves all items from one list to the other, in the direction indicated.