I was temporarily relocated to a different location by my company and people at the new location have helped me to set everything up. I interrupted one colleague a couple of times because of minor questions (e.g., how do I connect to this printer? Who is responsible for this and that? May I get a different keyboard and so on).
Sometimes, I would walk back to my office and make use of whatever information he gave me. I'd then like to thank him, but I don't really want to interrupt him again. Should I send a short "thank you" email although he is just a couple of steps away? Or just mention it the next time I see him?