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In this paper, we define a new language called LOTOS/M which enables dynamic establishment of multi-way synchronization channels among multiple agents (processes running on mobile hosts) on ad hoc networks, and show how it can be applied to designing wireless mobile applications. In LOTOS/M, a system specification is given by a set of independent agents. When a pair of agents is in a state capable of communicating with each other, a synchronization relation on a given gate (channel) list can dynamically be assigned to them by a new facility of LOTOS/M: (i) advertisement for a synchronization peer on a gate list and (ii) participation in the advertised synchronization. The synchronization relation on the same gate list can also be assigned to multiple agents to establish a multi-way synchronization channel incrementally so that the agents can exchange data through the channel. When an agent goes in a state incapable of communication, a synchronization relation assigned to the agent is canceled and it can run independently of the others. By describing some examples, we have confirmed that typical wireless mobile systems can easily be specified in LOTOS/M, and that they can be implemented efficiently with our LOTOS/M to Java compiler.