A method of sharing a group of one or more objects between a plurality of users, in which one or more of said plurality of users is able to change parameter data of at least one said object. The method comprises storing at least one version of each said object; when an object is changed, creating a new...http://www.google.com.au/patents/US7840543?utm_source=gb-gplus-sharePatent US7840543 - Method for sharing groups of objects
