—In new internet applications, up-to-date information is vital. Users ask for a constant flow of information. New technologies offer a myriad of data sources but these information rapidly become obsolete. Social networks and Internet of Thing, whose importance never stopped growing in the past decade, are excellent examples of applications where up-to-date data is both key and volatile. Sensors can change values in a mater of seconds. With the WebSocket protocol, W3C is offering a solution for real-time applications for developers. However the protocol itself relies on the use of sub-protocols to function, most of which are message oriented. MUST is a full-duplex and object or state oriented sub-protocol. Its similarities with HTTP makes it familiar and easy to use for web development. And it is aimed to be object-oriented architecture friendly.