what are the legalities behind registering a supercharged car?

Hi,

Just curious as to what needs to be done to engineer the car to be legal after the addition of a supercharger? I understand that an engineers cert will have to be done but what other criterias are there it other rules that we need to abide too in order for it to be legal?
And what processes do we need to do?

There are a few supercharged builds that I've seen so it would interesting if you can chime in.

Its just something I might consider later on but just want to know how possible it would be to have it all registered.

Cheers for the input.