Then there are no differences in any language. You can JMP, goto, call, or send a message in any programming language to do what you want. So there are no differences between languages. Wait, reality check, it's a library function he tried to sell off as a complete solution, which it is clearly not.

But Linux already dominates. Most used mobile OS. Powers the entire internet. Most used web-facing server OS. Literally the only viable OS for serious scientific computation. Very popular amongst developers. Used more and more on appliances. Also it's less than 1% on the desktop only if you subscribe to agencies on Microsoft's pay. It's over 1.5% from what I've gathered.