I would like to use CategoryGetName() to check whether a particular category index value is currently in use. My testing shows that it will return an empty string if the given index value isn't currently in use, however, I'm not quite sure if I can count on this given the comment in the documentation that it "may display a fatal error message if the index is out of range". I can ensure that the index value will be within the range 0-15 inclusive - will that guarantee that the function will work the way I want it to? (note that I might pass in an index value that's higher than the highest index value actually in use) Thanks! Stephen