In the system completion codes documentation it says that for an abend FDB that 
register 2 points to the request block prefix.  What is a 'request block 
prefix' in this context?

Verbatim it reads:
"When nn is not equal to 13, 14, 17, or 37, the system records in register 2 
the address of the request block prefix for the program that issued the 
incorrect SVC."

Thanks in advance for any advice.
Regards,
Lindy

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