This paper describes the implementation of an integration framework to buil
d real-time monitor programs based on software reuse. A custom-made real-ti
me monitor program can be built very quickly by integrating existing monito
r programs on commercial operating systems, where limited real-time system
support is provided. We address issues related to software control, output
re-processing, data age, and interactivities of program executions. The fea
sibility of this framework is demonstrated by the construction of an integr
ation environment and a monitor program built by the environment for soft r
eal-time applications in the Microsoft Windows operating systems. We also m
easure the incurred system overheads of this approach.