HP ALLBASE supports both network and relational data access and runs under both the MPE XL and the HP-UX operating systems. Migration of existing data bases to the new architecture has been carefully planned for. In addition to ALLBASE, the data base management software for HP Precision Architecture computers includes a migration package that helps customers move their existing data bases and applications to ALLBASE, and query products that allow users to access their HPIMAGE and HPSQL data bases without writing programs. An overview of ALLBASE and all its major software components is given. Described are: transaction management, concurrency control, logging and recovering and various query products.