DEFINE

(define const-name const-value)
(define PI 3.14159)
(define* MyThing "Cool")

This is used to define a constant into the output code. The var-name and the expression must be valid to the back-end coder. Using the define* version means that the back-end coder is to make the definition case-sensitive.

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Running the above examples through the PHP back-end:

define('PI', 3.14159);
define('MyThing', "Cool", TRUE);

You can see that the define* for the last one has made the PHP coder use the TRUE value in the define command to cause the name to be case-sensitive at run-time.

And the javaScript back-end:

var PI = 3.14159;
var MyThing = "Cool";

javaScript doesn't really have the notion of a formal constant and so the usual practice is to use all uppercase for the names and define that as file level scoped variables so that they can be used everywhere.