ener.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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.
Invalid name (ERR: 81)
■ The rules of naming an ISAM object (such as a table, column,
  or index) are different from the rules for naming a Visual
  Basic object (such as a variable or procedure). For example,
  ISAM names:
 
  • Have no more than 30 characters.
 
  • Use only the characters A-Z, a-z, and 0-9.
 
  • Begin with an alphabetic character.
 
■ Possible solution:
 
  • Verify that your ISAM object adheres to the ISAM
    naming conventions defined above and change the
    reference as required.
 
■ If you need additional help, move the cursor to a keyword
  and press F1 to open the Help window.