Usage of operating systems is like living in countries: There are laws, things you may or may not do. Also, there are people, talking one or two certain languages, behaving in a certain way. Operating systems are like that: There are restrictions on the system what you can do and what is more difficult. And there is software, supporting certain languages, behaving in a certain way. You can of course decide to use two or more OSes, but it's like renting a holiday cottage and visiting it a few tim