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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.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 expression for Instant Watch
■ The cursor is not on a program line that contains a valid
  expression. The Instant Watch command expects the cursor
  to be on an expression whose value you want to see.
 
■ Possible solution:
 
  • Reposition the cursor within the expression you want
    to watch and try again.
 
■ Tip: In a complex expression, it can be difficult to decide
       where to put the cursor. You can clearly indicate what
       the Instant Watch command should watch by highlighting
       it. Place the cursor to the extreme left or right of
       the expression and press Shift+right arrow or Shift+
       left arrow until the expression is highlighted.
 
■ If you need additional help, move the cursor to a keyword
  and press F1 to open the Help window.