A method is described for distance vector routing of on-demand traffic between routers within an ad-hoc network maintaining multiple loop-free paths to destinations. According to various embodiments, the sequence of actions undertaken in established Presence procedures are changed, and enhancements are also provided for Watcher information notifications. The global context sensitive augmented content is generated using metrics based on the overall document or content being viewed, while the local context sensitive augmented content is generated using metrics based on the currently viewed or selected object within the document or content being viewed. The data sets which define the generic basic functions, together with their distribution rules for access by a product template configurator, are contained in a basic function list. The turbo-molecular pump of the present invention can reduce a stress in the downstream end of the first cylindrical body. By controlling the operation of the power supply side constant current circuit and the ground side constant current circuit with a control circuit, the control circuit switches the switch circuit on and off to prevent a voltage drop due to an electric current that turns on the switch circuit.