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

       /SWAPPING (default)
       /NOSWAPPING

    Requires PSWAPM (process swap mode) privilege to inhibit process
    swapping.

    Permits the process to be swapped. The default allows a process
    to be swapped from the balance set in physical memory to allow
    other processes to execute.

    With /NOSWAPPING in effect, the process is not swapped out of the
    balance set when it is in a wait state. By default, a process may
    be swapped out of the balance set whenever it is in a wait state.