bas7ener.hlp (Topic list)
Important Notice
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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.
QBX function not defined
The function defined by DEF FN cannot be called, which
can indicate one of the following conditions:
   ■ The DEF FN function is undefined.
   ■ The DEF FN function calls another function that is
     undefined.
   ■ The DEF FN function is attempting to call itself
     recursively.