Library /sys$common/syshlp/dbg$help.hlb DEBUG, Messages, UNAACCREG  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 unable to access beyond end of register set

    Facility: DEBUG, VMS Debugger

    Explanation: The command entered attempted to read or write
    beyond the end of a register or register set.

    User Action: Re-enter the command, insuring that you do not
    attempt to access beyond the end of the register set.