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.|