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1. Perhaps you mean SysCheck. Wad is simply a packaging/delivery format with regard to data that's put onto the Wii. Look here to learn how to do this.
2. Look here.
3. Why don't you bother to check for the blog this was mentioned in?
All the above illustrates the fact you either haven't bothered searching (the box in the upper right corner) or never made an Introductions post to get the search tutorial, to maximize your results.