Early indications concerning Sun Microsystems Inc’ policy over its ongoing Unix System V.4 development suggest that Sun is currently less than willing to license the technology to the growing band of Sparc system builders through Sparc International, instead hoping to keep it as a value-added plus: although it’s early days, such a move could be a stumbling block to Sparc developers – but with V.4 implementations already emerging from the likes of ICL Ltd, dependence on the Sun operating system software may not be so crucial in the future.