KCB contains some fields previously found in CSA. It contains the address of the KE-Task table which map work unit to TCB (QR, CO, RO resource owning etc). It also co gain pointers to the KSS (kernel stack segments) which is 2 stacks (24 and 31 bits) used for save area for each KE task when module calling. KSS is in MVS storage separate form application for better protection.
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