Gnus Manual. Node: The Summary Buffer
The Group Buffer
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The Article Buffer
Chapter 3: The Summary Buffer
A line for each article is displayed in the summary buffer. You can
move around, read articles, post articles and reply to articles.
The most common way to a summary buffer is to select a group from the
group buffer (see Selecting a Group).
You can have as many summary buffers open as you wish.
The Group Buffer
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The Article Buffer