The method of the invention consists, in a system of the type with three “tiers” , in inserting a fourth “tier” which is the business interaction and which makes it possible to obtain a user-system interaction component that is independent of the services of the application and of the media....http://www.google.co.uk/patents/US8020174?utm_source=gb-gplus-sharePatent US8020174 - Method for making user-system interaction independent from the application of interaction media
