SV_RESTRICTNULLSESSACCESS_INFOLOEVEL

Undocumented in source but is binding to Windows. You might be able to learn more by searching the web for its name.
version(Windows)
extern (Windows) const
auto SV_RESTRICTNULLSESSACCESS_INFOLOEVEL = (PARMNUM_BASE_INFOLEVEL + SV_RESTRICTNULLSESSACCESS_PARMNUM);

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