Cooperative planning system and method

A medical treatment planning system which enables multiple collaborators in different locations to interactively view and manipulate data for use in, for example, preparing a treatment plan while also interacting with each other. Interactive medical treatment planning involving multiple participants using multiple treatment planning stations includes establishing one of the treatment planning stations as a session controller and launching treatment planning software thereon; establishing a communication connection between the session controller planning station and all of the treatment planning stations participating in a planning session; and displaying, on all participating treatment planning stations, treatment plan information being displayed on the session controller treatment planning station. The system also designates one of the treatment planning stations as an active controller for controlling manipulation of the treatment planning information, which may be regulated by the session controller treatment planning station.