Program documentation plays a vital role in almost all programming processes. Program documentation flows between separate tools of a modularized environment, and in between the components of an integrated development environment as well. In this paper we discuss the flow of program documentation between program development tools. In the central part of the paper we introduce a mapping of documentation flow between program development tools. In addition we discuss a set of locally developed tools which is related to program documentation. The use of test cases as examples in an interface documentation tool is a noteworthy and valuable contribution to the documentation flow. As an additional contribution we identify several circular relationships which illustrate feedback of documentation to the program editor from other tools in the development environment. 1.

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