Using Director > Writing Scripts with Lingo > Expressing literal values > Expressing constants |  |

Expressing constants

A constant is a named value whose content never changes. For example, `TRUE`, `FALSE`, `VOID`, and `EMPTY` are constants because their values are always the same.

The constants `BACKSPACE`, `ENTER`, `QUOTE`, `RETURN`, `SPACE`, and `TAB` refer to keyboard characters. For example, to test whether the user is pressing the Enter key, use the following statement:

    if the key = ENTER then beep