Abstract: Methods and apparatus, including computer program products, for triggering server state change using references. A method includes receiving a request to change a state of the server system, interpreting the request to determine which property is indicated by the reference, computing a value for the property, and using the value to change the state of the server system in accordance with the request. In that method, the request is received at a first program residing at a server system, the request is from a second program residing at a client system, and the request includes a reference to a property.