It's quite easy to do, first you have to litter train your cat & then you slowly move your litter tray to the toilet. Then on top of the toilet, in the toilet etc. Full details on http://www.teachmycat.com
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If you are talking about the litter box, I suggest that you keep all the areas extra clean, and put all the litter n the box. it will go there if it smells its scent, i think.
Uh...I really wouldn't want my Fluffy around the toilet, so I would abandon this idea, as good as it is.