Beside the scenario, the technique behind is also worth investigating. Different AR frameworks were introduced to support the development of AR applications. Distributed Wearable Augmented Reality Framework (DWARF) (see [8]) is a very well-engineered and well-developed framework. It is built on a service oriented, distributed architecture and relies on the Common Object Request Broker Architecture (CORBA) [9]. This leads to a high modularity of DWARF. However, the initial training effort is very high. Performance may also be an issue for mobile devices with moderate hardware equipment.