A reservation is not required, and usually there are computers available.
There is rarely a wait of longer than 10 minutes for a computer. However, on Sundays there can be a longer wait because the only library that opens is Lawson McGhee Library. You can call ahead to request a reservation; this requires your library account sign-in (card number and password). Telephone reservations must be made at least 60 minutes prior to the start of the session.