[Boost-users] Clients controlling server and other clients

I am writing an application in which one of multiple clients need to control the server and the other clients. The example is the timeline of a flipbook player. If one client sets the timeline to 125, both the server and the other clients need to jump to frame 125. If the server's timeline is modified to 200, indeed the timeline needs to be set to the new value in all clients. I am puzzled on how to write this with asio. Any help is appreciated.