The CEEDOPT (non-CICS) and CEECOPT (CICS) assembler files contain default values for all Language Environment runtime options. At installation time, you can edit this file and select defaults that will apply to all applications running in the common environment (except OS/VS COBOL programs under CICS).
You can select a nonoverridable (fixed) attribute for options within this module. This attribute allows your installation to enforce options that might be critical to your overall operating environment.
For information on how to set installation-wide default runtime options for Language Environment, see Language Environment for z/OS Customization