Get the starting position for iterating the function map
[C++]
CXllApp::POSITION GetStartFnPosition();
A CXllApp::POSITION value that indicates a starting position for iterating the function map; 
            or NULL if the map is empty.
Starts a map iteration by returning a CXllApp::POSITION value that 
			can be passed to a GetNextFnAssoc call. 
            The iteration sequence is not predictable; therefore, the "first element in the map" 
            has no special significance.
Header: xllplus.h