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out of date.
30809
THE EXPRESSION IS NOT VALID.
The syntax is incorrect, or you are missing an
operator.
■ Check the expression and make the necessary
corrections.
■ For more information, see Ch. 22, "Macros,"
in the Using Manual.