auctex: Marking

 
 2.7 Marking Environments, Sections, or Texinfo Nodes
 ====================================================
 
 You can mark the current environment by typing 'C-c .', or the current
 section by typing 'C-c *'.
 
    In Texinfo documents you can type 'M-C-h' to mark the current node.
 
    When the region is set, the point is moved to its beginning and the
 mark to its end.
 

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