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3.3.2 Choosing Variables

Some variables relevant for moving and selecting articles:

gnus-auto-extend-newsgroup
All the movement commands will try to go to the previous (or next) article, even if that article isn't displayed in the Summary buffer if this variable is non-nil. Gnus will then fetch the article from the server and display it in the article buffer.
gnus-select-article-hook
This hook is called whenever an article is selected. The default is nil. If you would like each article to be saved in the Agent as you read it, putting gnus-agent-fetch-selected-article on this hook will do so.
gnus-mark-article-hook
This hook is called whenever an article is selected. It is intended to be used for marking articles as read. The default value is gnus-summary-mark-read-and-unread-as-read, and will change the mark of almost any article you read to gnus-read-mark. The only articles not affected by this function are ticked, dormant, and expirable articles. If you'd instead like to just have unread articles marked as read, you can use gnus-summary-mark-unread-as-read instead. It will leave marks like gnus-low-score-mark, gnus-del-mark (and so on) alone.