HP 3000 Manuals HP 3000 Manuals
HP ALLBASE/4GL System HP ALLBASE/4GL is available in two versions: the full developer system and the run-time environment. The developer system contains all the facilities necessary to develop and run applications. The run-time environment provides the necessary facilities for application end users to run developed applications. HP ALLBASE/4GL consists of five major functional components: * Operating System Interface * Data Manager * Administrator * End User Applications * Developer The run-time environment includes all functional components of HP ALLBASE/4GL except the developer application. The Operating System Interface HP ALLBASE/4GL operates on Hewlett-Packard HP 3000 series 900 computer systems using the MPE/iX operating system. The HP ALLBASE/4GL operating system interface handles all the communication with the host operating system. For the most part, you will never need to use MPE/iX commands while developing applications. If the need arises, however, you can use the MPE/iX system to run external programs in a language other than HP ALLBASE/4GL. You can call such external programs from within HP ALLBASE/4GL. Data Manager The data manager handles all access to application databases. The data manager allows multiple users and multiple applications to access the same database simultaneously. A built-in KSAM (Keyed Sequential Access Method) data file manager provides the facilities to create and delete KSAM data files, and you can also use serial files in an HP ALLBASE/4GL application. The data manager provides access to HP ALLBASE/SQL databases and HP TurboIMAGE/iX within HP ALLBASE/4GL. Administrator The administrator is an HP ALLBASE/4GL application. Your system administrator uses the administrator application to define system user names, applications and versions, and various system wide defaults. End User Applications HP ALLBASE/4GL supports two types of end user applications: base applications and versions. A base application contains all the logic required to run that application. A version uses the underlying base application logic but includes an additional set of definitions that modify it for a particular end user or group of end users. A version cannot run unless its base application exists on the same system. Developer The HP ALLBASE/4GL developer is also an HP ALLBASE/4GL application. This is the application that you use to create end user applications. As you work through the lessons in this guide, you will be using the developer facilities to develop a working application.