Updating the values of system symbols dynamically

z/OS® V2R1 supports updating the values of system symbols dynamically. A new keyword on the SETLOAD operator command enables you to specify that the values of local static system symbols are updated using the values from an IEASYMxx member of parmlib.

Description:
When change was introduced:
z/OS V2R1.
Reference information:
z/OS MVS System Commands