Bonus clearing at party skins

[jakbse]

Late July I was tired of waiting for a reload bonus offering from Party, which until that point was the only site I had played. I started looking for alternatives and found Multipoker which had a decent sign-up offer and works fine with PT.
I signed up, made a maximum deposit of $500 and started to play.
Later I have heard that you need to use a different computer when you sign up for a party skin. I don’t know why, I used my ordinary computer without any problems.
Which are the rules that apply? I don’t want to cheat or put myself in any sort of trouble. If I had heard this before I went to Multipoker I would have signed up for Abolute or whatever instead.