+ <boolean id="amiga" _label="AmigaDOS" arg-unset="-no-amiga"/>
+ <boolean id="atari" _label="Atari" arg-set="-atari"/>
+ <boolean id="apple2" _label="Apple II" arg-unset="-no-apple2"/>
+ <boolean id="nvidia" _label="Nvidia" arg-unset="-no-nvidia"/>
+ </vgroup>
+ <vgroup>