LISTENV-OPEN
The LISTENV-OPEN function opens the list of the available configuration properties.
Syntax:
 CALL "C$LIST_ENVIRONMENT" USING LISTENV-OPEN                           GIVING listenvHandle  | 
Parameters:
Return code:
listenvHandle must be an USAGE HANDLE data item. It receives the handle of the list of properties and will be used with the 
LISTENV-NEXT and 
LISTENV-CLOSE functions.