gnus: Scanning New Messages

 
 2.18.1 Scanning New Messages
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 ‘g’
      Check the server(s) for new articles.  If the numerical prefix is
      used, this command will check only groups of level ARG and lower
      (‘gnus-group-get-new-news’).  If given a non-numerical prefix, this
      command will force a total re-reading of the active file(s) from
      the back end(s).
 
 ‘M-g’
      Check whether new articles have arrived in the current group
      (‘gnus-group-get-new-news-this-group’).
      ‘gnus-goto-next-group-when-activating’ says whether this command is
      to move point to the next group or not.  It is ‘t’ by default.
 
 ‘C-c M-g’
      Activate absolutely all groups (‘gnus-activate-all-groups’).
 
 ‘R’
      Restart Gnus (‘gnus-group-restart’).  This saves the ‘.newsrc’
      file(s), closes the connection to all servers, clears up all
      run-time Gnus variables, and then starts Gnus all over again.
 
    ‘gnus-get-new-news-hook’ is run just before checking for new news.
 
    ‘gnus-after-getting-new-news-hook’ is run after checking for new
 news.