Gnus Manual - Group Levels Go to the first , previous , next , last section, table of contents .
All groups have a level of subscribedness .
For instance, if a group is on level 2, it is more subscribed than a group on level 5. Set the level of the current group. If a numeric prefix is given, the next n groups will have their levels set. The user will be prompted for a level. Gnus treats subscribed and unsubscribed groups exactly the same, but zombie and killed groups have no information on what articles you have read, etc, stored.