The pages on this site contain documentation for very old MS-DOS software,
purely for historical purposes.
If you're looking for up-to-date documentation, particularly for programming,
you should not rely on the information found here, as it will be woefully
out of date.
Error Message
Error 4: Too many nested files
The program nests include files too deeply. If the files
included must include other files, keep the nesting to a
maximum depth of eight files.
Convert some of the include files to units.