You can use MODSET KEY=ZERO to put yourself in KEY0. Then you can modify any storage you have access to which includes the operating system. This can be dangerous. If you modify the wrong area of memory you can cause other programs to fail and they will have a difficult time figuring out what happened. The general practice is to go into KEY0 for only the specfic instructions that you need. Then go back to your normal KEY. MODESET KEY=NZERO .
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