This part contains information about Natural under the operating system z/OS.
The following topics are covered:
| Natural under z/OS | Contains an overview of special considerations that apply when you are running Natural under z/OS online or in batch mode. | 
| Authorized Services Manager | Describes the functionality and operation of the Authorized Services Manager (ASM) which is available under z/OS. | 
| Natural Roll Server Functionality | Explains the functions of the Natural Roll Server in general, its use in a single z/OS system and in a z/OS Parallel Sysplex environment. | 
| Natural Roll Server Operation | Provides information on the roll server system requirements, operation, performance tuning and restart capability. | 
Note:
 The codes that Natural may receive when the Roll Server is used
                         during a Natural session runtime are output by the corresponding teleprocessing
                         interfaces (Natural under
                            CICS or Natural under IMS
                            TM). For a list of these codes, refer to the
                         Return Codes and Reason Codes
                            of the Roll Server Request in the Messages and
                            Codes documentation.