it's hard to know what to do with the word "exist"
you can't ever know that you exist, you might be a simulation.
its the [computational] process itself that is the real thing , it doesn't have to exist in any ordinary sense. "
I wouldn't use the word real at all, I think it's obsolete and unnecessary...to say that this button is real in this universe make sense, to ask if the universe itself is real makes no sense at all.
I also think I am a bit of an anti-realist – not that I don't believe in reality, but I think that the concept of "the Real" is useless, especially if anything you can think of is real. If that's the case, the word draws no useful distinctions and should be avoided. Unless you split it up, maybe: my desk is real, Beauty is real, and my imaginary dragon friend are all real, but they are not real in the same ways and we need to understand how those different modes work, and how they relate to each other. Perhaps they are all aspects of the one real Real, which we cannot grasp directly.