we can't do that in Denmark where all about you is registered although some do. It is not enough to say you have an address somewhere - it has to be registered in a central register. And if you live permanently in let's say Thailand and have an address at a Danish friend and are on a pension and the pension authorities find out it is considered to be fraud and they will demand you pay back pension you were not entitled to (because you get more in pension if living in a Schengen country) - and that could be for several years and cost a lot.