>Thanks.
>
>Is there some way to find constant values for API routines in general?

The name of the header file is listed at the bottom of MSDN topic for specific function. If you've VC++ or Platform SDK installed, You can find the header files in the 'include' subdirectory. Some of the you can find at http://cvs.sourceforge.net/viewcvs.py/mingw/w32api/include/