Partial evaluation is an optimization technique traditionally used in compilation. We have adapted this technique to the understanding of scientic application programs during their maintenance and we have implemented a tool. This tool analyzes Fortran 90 application programs and performs an interprocedural pointer analysis. This paper presents how we have specied this analysis with different formalisms (inference rules with global denitions and set and relational operators). Then we present the tool implementing these specications. It has been implemented in a generic programming environment and a graphical interface has been developed to visualize the information computed during the partial evaluation (values of variables, already analyzed procedures, scope of variables, removed statements, ...).