The following information is provided for each line of the SHOW
    CALLS display:

    o  The name of the enclosing module. An asterisk (*)  to the left
       of a module name indicates that the module is set.

    o  The name of the calling routine, provided the module is set
       (the first line shows the currently executing routine).

    o  The line number where the call was made in that routine,
       provided the module is set (the first line shows the line
       number at which execution is suspended).

    o  The value of the PC in the calling routine at the time
       that control was transferred to the called routine. On VAX
       processors, the PC value is shown as a memory address relative
       to the nearest preceding symbol value (for example, a routine)
       and also as an absolute address. On Alpha and Integrity server
       processors, the PC is shown as a memory address relative to
       the first code address in the module and also as an absolute
       address.

       When you specify the /IMAGE qualifier, the debugger first does
       a SET IMAGE command for each image that has debug information
       (that is, it was linked using the /DEBUG or /TRACEBACK
       qualifier). The debugger then displays the image name for
       each active call on the calls stack. The output display has
       been expanded and displays the image name in the first column.

       The debugger suppresses the share$image_name module name,
       because that information is provided by the /IMAGE qualifier.

       The SET IMAGE command lasts only for the duration of the SHOW
       CALLS/IMAGE command. The debugger restores the set image state
       when the SHOW CALLS/IMAGE command is complete.

    Related commands:

       SHOW SCOPE
       SHOW STACK