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out of date.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 105: Circular unit reference
A circular reference was made in the interface
section of a unit.
Circular references are allowed only in the
implementation sections of units.