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Various Various
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`gnus-home-directory'
     All Gnus path variables will be initialized from this variable,
     which defaults to `~/'.

`gnus-directory'
     Most Gnus storage path variables will be initialized from this
     variable, which defaults to the `SAVEDIR' environment variable, or
     `~/News/' if that variable isn't set.

     Note that Gnus is mostly loaded when the `.gnus.el' file is read.
     This means that other directory variables that are initialized
     from this variable won't be set properly if you set this variable
     in `.gnus.el'.  Set this variable in `.emacs' instead.

`gnus-default-directory'
     Not related to the above variable at all--this variable says what
     the default directory of all Gnus buffers should be.  If you issue
     commands like `C-x C-f', the prompt you'll get starts in the
     current buffer's default directory.  If this variable is `nil'
     (which is the default), the default directory will be the default
     directory of the buffer you were in when you started Gnus.

`gnus-verbose'
     This variable is an integer between zero and ten.  The higher the
     value, the more messages will be displayed.  If this variable is
     zero, Gnus will never flash any messages, if it is seven (which is
     the default), most important messages will be shown, and if it is
     ten, Gnus won't ever shut up, but will flash so many messages it
     will make your head swim.

`gnus-verbose-backends'
     This variable works the same way as `gnus-verbose', but it applies
     to the Gnus back ends instead of Gnus proper.

`nnheader-max-head-length'
     When the back ends read straight heads of articles, they all try
     to read as little as possible.  This variable (default 4096)
     specifies the absolute max length the back ends will try to read
     before giving up on finding a separator line between the head and
     the body.  If this variable is `nil', there is no upper read
     bound.  If it is `t', the back ends won't try to read the articles
     piece by piece, but read the entire articles.  This makes sense
     with some versions of `ange-ftp' or `efs'.

`nnheader-head-chop-length'
     This variable (default 2048) says how big a piece of each article
     to read when doing the operation described above.

`nnheader-file-name-translation-alist'
     This is an alist that says how to translate characters in file
     names.  For instance, if `:' is invalid as a file character in
     file names on your system (you OS/2 user you), you could say
     something like:

          (setq nnheader-file-name-translation-alist
                '((?: . ?_)))

     In fact, this is the default value for this variable on OS/2 and MS
     Windows (phooey) systems.

`gnus-hidden-properties'
     This is a list of properties to use to hide "invisible" text.  It
     is `(invisible t intangible t)' by default on most systems, which
     makes invisible text invisible and intangible.

`gnus-parse-headers-hook'
     A hook called before parsing headers.  It can be used, for
     instance, to gather statistics on the headers fetched, or perhaps
     you'd like to prune some headers.  I don't see why you'd want
     that, though.

`gnus-shell-command-separator'
     String used to separate two shell commands.  The default is `;'.

`gnus-invalid-group-regexp'
     Regexp to match "invalid" group names when querying user for a
     group name.  The default value catches some *really* invalid group
     names who could possibly mess up Gnus internally (like allowing
     `:' in a group name, which is normally used to delimit method and
     group).

     IMAP users might want to allow `/' in group names though.