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For Info to work, the `info' directory must contain a file that serves as a top level directory for the Info system. By convention, this file is called `dir'. (You can find the location of this file within Emacs by typing C-h i to enter Info and then typing C-x C-f to see the pathname to the `info' directory.)

The `dir' file is itself an Info file. It contains the top level menu for all the Info files in the system. The menu looks like this:

* Menu:

* Info:    (info).     Documentation browsing system.
* Emacs:   (emacs).    The extensible, self-documenting
                       text editor.
* Texinfo: (texinfo).  With one source file, make 
                       either a printed manual using 
                       TeX or an Info file.
...

Each of these menu entries points to the `Top' node of the Info file that is named in parentheses. (The menu entry does not need to specify the `Top' node, since Info goes to the `Top' node if no node name is mentioned. See section Referring to Other Info Files.)

Thus, the `Info' entry points to the `Top' node of the `info' file and the `Emacs' entry points to the `Top' node of the `emacs' file.

In each of the Info files, the `Up' pointer of the `Top' node refers back to the dir file. For example, the line for the `Top' node of the Emacs manual looks like this in Info:

File: emacs  Node: Top, Up: (DIR), Next: Distrib

(Note that in this case, the `dir' file name is written in upper case letters--it can be written in either upper or lower case. Info has a feature that it will change the case of the file name to lower case if it cannot find the name as written.)


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