Constants

A constant is a property whose value never changes.

For example, the constants BACKSPACE, ENTER, QUOTE, RETURN, SPACE, and TAB are properties of the Key object and refer to keyboard keys. To test whether the user is pressing the Enter key, you could use the following statement:

if(Key.getCode() == Key.ENTER) {
  alert = "Are you ready to play?";
  controlMC.gotoAndStop(5);
}