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Hrm, I think its difficult to define it as clearly as that - skills, abilities, races and classes are often the means used to extend the gameplay. Archery skills and elven lore to utilise your ranged combat system, darkvision and lycanthrope senses to take advantage of your line-of-sight code, magic-using classes and associated skills as the means to access your original magic system, and so on.
I suppose you could argue that in such cases the skills, races, etc are simply the interfaces through which you access the gameplay, but if you do that it raises the question of what exactly a 'class' or 'race' is.
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