CSM controls every data access to remote devices (disk/tapes) and executes them synchronously.
As a result there a new ways to access data that didn’t exist before , especially over CPU-bounbaries.
CSM works synchrounously, wich means that every event, that can occurr while accessing data (e.g D37,S013 ,S91) is treated like it is know to the system the job is running on.
Naturrally this includes remote security checks wich validate if and how data is allowed to be accessed.
mainframe diagram

Through OMC-VNI, legacy application performance can be significantly improved:

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