QA Build, or QAB for short, is the DP4 environment for producing application programs quickly. The QA Build program editor consists of a series of menus and questions which determine how each part of your program is to work. Your responses are used to generate a program that is analysed as partially compiled with the QA Build compiler, and then executed, either with the standard QA Build Interpreter (PROGRUN), or a version of the Interpreter that you have extended by adding to it your own C functions called from QAB, or which contains C functions that call QAB programs.
If you are new to QAB and would like a brief overview of what it is and how to use it you should refer to the appropriate sections of the Introduction to DP4, which can be found here .