Library /sys$common/syshlp/DBG$HELP.HLB  —  DEBUG  Built in Symbols, %Bn
    On I64 systems, specifies branch registers %B0 through %B7, as
    follows:

    Register
    Symbol         Definition

    %B0            Branch register 0; return pointer
    %B1 . . . %B7  Branch registers 1 to 7
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