CALL "C$LIST_ENVIRONMENT" USING LISTENV-NEXT                                   listenvHandle                                   variableName  | 
LISTENV-NEXT   | Constant   | |
listenvHandle   | USAGE HANDLE   | Specifies the handle of a list of properties, returned by the LISTENV-OPEN function.  | 
variableName   | PIC X(n)   | Receives the name of the next property in the list. When no more properties  are available, variableName is set to spaces.  |