/sys$common/syshlp/SYSGEN.HLB  —  Sys Parameters, USERD2
    USERD2 is reserved for definition at the user's site. The
    reserved longword is referenced by the symbol SGN$GL_USERD2.

    On Alpha and Integrity servers, this symbol is in the
    SYS$LOADABLE_IMAGES:SYS$BASE_IMAGE module.

    USERD2 is a DYNAMIC parameter.
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