DEFINE Directive
The DEFINE directive defines a compiler constant.
>> DEFINE ConstantName AS ConstantValue [OVERRIDE]  | 
Syntax:
1.	ConstantName is the name of the constant to be set. This name is case insensitive.
2.	ConstantValue is the value of the constant.
General rules:
1.	The Constant is defined and set to the ConstantValue.
2.	Use the OVERRIDE clause to re-define a previously set constant.
Alternative syntax
The following equivalent syntax is supported for compatibility:
$SET CONSTANT ConstantName ConstantValue  | 
The dollar sign must appear in the source indicator area.
Example
Define the DEBUG compiler constant set to 1:
           >>DEFINE DEBUG 1        program-id. eg001.         ...  |