Compsoft Delta Ltd, MS-DOS software marketing and services arm of Compsoft Holdings Plc, Godalming, Surrey, has launched a single user relational database version of its MS-DOS Delta 4.3 transactional database. The company also launched an MS-DOS data analysis and consolidation system, Debut, at UKP2,500. A multi-user version of Delta 5 will be shipped in October. Compsoft said Delta 5 offers users the capability of a relational structure and the power of transactional methods to provide users with a more powerful applications builder.