The articles are displayed in the article buffer, of which there is only one. All the summary buffers share the same article buffer unless you tell Gnus otherwise.
|• Hiding Headers||Deciding what headers should be displayed.|
|• Using MIME||Pushing articles through MIME before reading them.|
|• HTML||Reading HTML messages.|
|• Customizing Articles||Tailoring the look of the articles.|
|• Article Keymap||Keystrokes available in the article buffer.|
|• Misc Article||Other stuff.|