VMS Help Sys Parameters, LOAD_SYS_IMAGES  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    This special parameter is used by Compaq and is subject to
    change. Do not change this parameter unless Compaq recommends
    that you do so.

    LOAD_SYS_IMAGES controls the loading of system images described
    in the system image data file, VMS$SYSTEM_IMAGES. This parameter
    is a bit mask.

    On VAX systems, the following bit is defined:

    Bit                         Description

    0 (SGN$V_LOAD_SYS_IMAGES)   Enables loading alternate execlets
                                specified in VMS$SYSTEM_IMAGES.DATA.

    On Alpha systems, the following bits are defined:

    Bit                         Description

    0 (SGN$V_LOAD_SYS_IMAGES)   Enables loading alternate execlets
                                specified in VMS$SYSTEM_IMAGES.DATA.

    1 (SGN$V_EXEC_SLICING)      Enables executive slicing.

    2 (SGN$V_RELEASE_PFNS)      Enables releasing unused portions of
                                the Alpha huge pages.

    These bits are on by default. Using conversational bootstrap exec
    slicing can be disabled.

    On Alpha systems, LOAD_SYS_IMAGES is an AUTOGEN parameter.