Library /sys$common/syshlp/DBG$HELP.HLB  —  DEBUG  Built in Symbols, %CURLOC
    Specifies the current logical entity (that is, the program
    location last referenced by an EXAMINE, DEPOSIT, or
    EVALUATE/ADDRESS command). You can also use the period character
    (.)  for this purpose.

    Example:

    DBG> EXAMINE RADIUS
    CIRCLE\RADIUS:  0.0000000E+00
    DBG> DEPOSIT %CURLOC = 1   ! Set RADIUS to 1
    DBG> DEPOSIT . = 2         ! Set RADIUS to 2
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