[Orgmode] What does C-c C-r do?

[Leo]

Dear all,

I still haven't figured out what `C-c C-r' does. Can someone give me
an example to see the effect of C-c C-r? Thanks in advance.

,----[ (info "(org)Visibility cycling") ]
| `C-c C-r'
|      Reveal context around point, showing the current entry, the
|      following heading and the hierarchy above.  Useful for working
|      near a location exposed by a sparse tree command (*note Sparse
|      trees::) or an agenda command (*note Agenda commands::).  With
|      prefix arg show, on each level, all sibling headings.  
`----

Regards,
-- 
Leo <sdl.web AT gmail.com>                         (GPG Key: 9283AA3F)