what are .hh files???

hi all,
i wanted to know if anyone knows about any file whose extention is .hh , and also how to include it in your project....
thanx in advance,
Tarek.

To my knowledge, one convention for naming C++ source files is with a ".cc" extension, so by analogy the header files would be ".hh". Should be exactly the same thing as a ".h" header file, unless your particular compiler is really picky about the file extensions.

A normal include statement should be all you need to use it; e.g.:
#include "aheader.hh"