HELP - defCmd
HelpCommand ReferencedefCmd
Description  
Documenting a define ( def )
Indicates that a comment block contains documentation for a #define macro.
Syntax
\def MAX(x,y)
Computes the maximum of x and y.

Output
The def command does not produce any output of its own, but ensures that the documentation comment block is used to document the define specified.
About putting the documentation in separate files
This command is used for documenting an entity away from it's definition in the code. See SeparateDocs for some examples.

The commands for making separate documentation are:

\class, \def, \enum, (\file), \fn, \namespace, \struct, \typedef, \union \var
Qualify with scope (class, namepace) if inside a scope like this:
\enum SepDocClass::ClassEnum