FreeFem++ is an implementation of a language dedicated to the finite element method. It provides you a way to solve Partial Differential Equations (PDE) simply. Problems involving partial differential equations (pde) of several branches of physics such as fluid-structure interactions require interpolations of data on several meshes and their manipulation within one program. In this report we build on a fast quadtree-based interpolation algorithm, propose a language for the manipulation of data on multiple meshes (generated with bamg) and test by designing an extension of freefem and of freefem+. Suggested add-ons: the ports graphics/xd3d, science/medit and math/gnuplot (medit and gnuplot are requested to run some examples).