It could be practical when writing high-performance code to modify a RENT module if it is not in key 0 (or use a PC to make the modification if in key 0). An example would be if an extensive chain of indirect pointers (or the NAME/TOKEN service), is used to locate life of IPL memory allocated for an application. If a location in the RENT module is zero, it locates the memory and stores the address (using CS) in the RENT module; if it's non-zero, it uses the value as the address. If CS fails, check for zero again. Since all executions would store the same value, no other serialization is needed. I'm not sure CS is needed if it's a fullword on a word boundary.
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