Typically, null-modem cables utilize RS-232 communications ports for transmission and receipt. Use of these cables may require handshake authentication. Null-modem cables are often used for localized gaming, where two computers are in proximity, or for linking a specific computer to a greater hardware system. The basic idea of using null-modem cables is that those who are paying for hardware setups can eliminate the purchase of connecting devices or more costly solutions just by using one of these crossover cables.