The SET DEFAULT command establishes the default repository
    directory for the current CDO session.

    You can use a logical name that translates to a search list
    as the path name in the SET DEFAULT command. After setting the
    default repository area, commands that directly affect elements,
    such as CHANGE, DEFINE, or DELETE, only operate on the first
    occurrence of the element in the search list. However, the
    DIRECTORY command searches through all the repository areas
    specified in the search list.