VMS Help RUN, Process, Qualifiers, /DUMP  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /DUMP
       /NODUMP (default)

    When an image terminates because of an unhandled error, the /DUMP
    qualifier causes the contents of the address space to be written
    to the file named image-name.DMP in the process's default device
    and directory. You can then use the Analyze/Process_Dump utility
    to analyze the dump.