IBM has already implied that the TOD register is intended to be a programming 
interface by stating in the POP manual:

“13. Uniqueness of TOD-clock values can be extended to apply to processors 
in separate configurations by including a configuration identification in the 
TOD 
programmable field.”

IBM should state (in z/OS documentation) that z/OS guarantees a unique 
value in each register of a sysplex (as suggested in the POP manual), 
however, the particular value is not a programming interface, only that the 
value will be unique within a sysplex. 

IBM should state in other operating system (z/VM, VSE, etc.) documentation, 
how it sets or does not set that register.

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