C# Signature:

        enum INSTALLUILEVEL
        {
            INSTALLUILEVEL_NOCHANGE = 0,    // UI level is unchanged
            INSTALLUILEVEL_DEFAULT  = 1,    // default UI is used
            INSTALLUILEVEL_NONE     = 2,    // completely silent installation
            INSTALLUILEVEL_BASIC    = 3,    // simple progress and error handling
            INSTALLUILEVEL_REDUCED  = 4,    // authored UI, wizard dialogs suppressed
            INSTALLUILEVEL_FULL     = 5,    // authored UI with wizards, progress, errors
            INSTALLUILEVEL_ENDDIALOG    = 0x80, // display success/failure dialog at end of install
            INSTALLUILEVEL_PROGRESSONLY = 0x40, // display only progress dialog
            INSTALLUILEVEL_HIDECANCEL   = 0x20, // do not display the cancel button in basic UI
            INSTALLUILEVEL_SOURCERESONLY = 0x100, // force display of source resolution even if quiet
        }

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