z/VSE internal commands for debugging
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There are internal system commands, that might be useful in case you want to debug the system. Those commands are described in the z/VSE Supervisor Diagnosis Reference manual (DRM). Besides the commands the DRM describes the design of the z/VSE Supervisor and how it exploits the z/Architecture. The DRM can be downloaded from the z/VSE documentation page - here.
The syntax of debug commands are described in Chapter 3: Diagnostic and Debugging Aids. Under Debugging Facilities we describe the DEBUG, LOCATE and SHOW command.
Please also read the disclaimer at the beginning of the Debugging Facilities section.