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#### 3.18.7 Article button levels

The higher the value of the variables `gnus-button-`*`-level`, the more buttons will appear. If the level is zero, no corresponding buttons are displayed. With the default value (which is 5) you should already see quite a lot of buttons. With higher levels, you will see more buttons, but you may also get more false positives. To avoid them, you can set the variables `gnus-button-`*`-level` local to specific groups (see Group Parameters). Here's an example for the variable `gnus-parameters`:

         ;; increase gnus-button-*-level in some groups:
         (setq gnus-parameters
               '(("\\<\\(emacs\\|gnus\\)\\>" (gnus-button-emacs-level 10))
                 ("\\<unix\\>"               (gnus-button-man-level 10))
                 ("\\<tex\\>"                (gnus-button-tex-level 10))))

`gnus-button-browse-level`
  Controls the display of references to message IDs, mail addresses and news URLs. Related variables and functions include `gnus-button-url-regexp`, `browse-url`, and `browse-url-browser-function`.
`gnus-button-emacs-level`
  Controls the display of Emacs or Gnus references. Related functions are `gnus-button-handle-custom`, `gnus-button-handle-describe-function`, `gnus-button-handle-describe-variable`, `gnus-button-handle-symbol`, `gnus-button-handle-describe-key`, `gnus-button-handle-apropos`, `gnus-button-handle-apropos-command`, `gnus-button-handle-apropos-variable`, `gnus-button-handle-apropos-documentation`, and `gnus-button-handle-library`.
`gnus-button-man-level`
  Controls the display of references to (Unix) man pages. See `gnus-button-man-handler`.
`gnus-button-message-level`
  Controls the display of message IDs, mail addresses and news URLs. Related variables and functions include `gnus-button-mid-or-mail-regexp`, `gnus-button-prefer-mid-or-mail`, `gnus-button-mid-or-mail-heuristic`, and `gnus-button-mid-or-mail-heuristic-alist`.