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 rereading of the active file(s) from the
     backend(s).

`M-g'
     Check whether new articles have arrived in the current group
     (`gnus-group-get-new-news-this-group').  The
     `gnus-goto-next-group-when-activating' variable controls 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').

   `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.