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@sectionIn a printed manual, an @section command identifies a
numbered section within a chapter.  The section title appears in the
table of contents.  In Info, an @section command provides a
title for a segment of text, underlined with =.
  
This section is headed with an @section command and looks like
this in the Texinfo file:
     @section @code{@@section}
     
  To create a section, write the @section command at the
beginning of a line and follow it on the same line by the section
title.
  
Thus,
     @section This is a section
     
produces
     This is a section
     =================
     
in Info.