The present invention describes a method for superimposing prespecified locational, environmental, and contextual controls on user interactions, including interactions of mobile users, with computational resources. A system is described for electronically monitoring contextual information concerning...http://www.google.com.au/patents/US5603054?utm_source=gb-gplus-sharePatent US5603054 - Method for triggering selected machine event when the triggering properties of the system are met and the triggering conditions of an identified user are perceived
