There is a list of frequently asked questions and their answers for the cxref program in the FAQ file. A list of improvements planned for future versions of the program are listed in the file TODO.
More up-to-date information can be found on the World Wide Web at the cxref homepage, reached via the author's homepage http://www.gedanken.demon.co.uk/.
If you wish to submit bug reports or other comments about the program then email the author amb@gedanken.demon.co.uk and put cxref in the subject line.