A range for the GroupOverview method (first-last).
This property specifies a range of articles for which to retrieve article overviews from the server. The format is 'first-last' where first is "" (empty string) or a positive number, and last is "" (empty string), a positive number, or the token end.
The default value of this property is '-', meaning 'all articles in the group'.
This property is not available at design time.