Crowthorne, Berkshire-based ICL systems house Ultracomp Ltd has signed a agreement with International Network Services Ltd to develop a range of communications software known as Trada-Unix, which will enable Unix users to access the Tradanet electronic data interchange – EDI – service operated by the General Electric-ICL International Network Services. Tradanet enables traders to exchange commercial documents via computer regardless of communications protocol. With a menu-driven interface, Trada Unix has autodialling features and a batch interface that enables other applications to control it, so that it can be integrated with existing software systems. Ultracomp has been going nine years and is looking for a turnover of UKP4m in 1990.