A computer lab isn't a room or a building any more. Worldwide, there are ~42% tablets, ~33% laptops, and ~25% desktop computers (my own distribution is also close to this). So ~75% of computers are highly mobile. Nowadays a "computer lab" is simply a (decentralized) set of hardware, software, and documentation (see my blog of 17 Dec. 2012). At any given time my computer lab is distributed across 5 or 6 rooms that I'm working in. The scanner, printer, server, router, modem, etc. are in one fixed location, however.