Specifies the logical predecessor of the current entity (that is,
    the program location that logically precedes the location last
    referenced by an EXAMINE, DEPOSIT, or EVALUATE/ADDRESS command).
    You can also use the circumflex character (^)  for this purpose.

    Examples:

    DBG> EXAMINE PRIMES(6)
    SIEVE\PRIMES(6):  13
    DBG> EXAMINE %PREVLOC
    SIEVE\PRIMES(5):  11
    DBG> EXAMINE ^  ! Equivalent to EXAMINE %PREVLOC
    SIEVE\PRIMES(4):  7