The invention relates to a technique of co-operation between a plurality of client entities communicating among themselves by way of at least one instantaneous-communication channel established between the client entities and said plurality. A first client entity of said plurality dispatches an executable application to at least one second client entity of said plurality by way of said at least one instantaneous-communication channel. This application is then executed by the first client entity in co-operation with an execution of said application on the second client entity.