This paper presents the design and the implementation of a platform allowing owners of mobile devices to exchange software application programs using a peer-to-peer scheme in hybrid networks as well as in pure dynamic networks, such as those composed of volatile communicating devices (e.g. PDA, laptops). This platform provides means to disseminate announcements or discovery requests of application programs in networks, thus permitting owners of mobile devices to announce to their neighbours what applications they can provide, while discovering themselves what applications are available in their neighbourhood.