A tracking method includes enabling a target device to obtain a location information thereof, and enabling the target device to generate a uniform resource locator, which contains the location information obtained thereby and a location of an electronic map-containing webpage of a website. At least some of the messages generated by an application residing in the terminal and destined for a communication network are diverted to an independent controlling entity also residing in the terminal. 9, Z1 and Z2 each represent \u2014CR1\u2550, where R1 represents a hydrogen atom or a substituent, or \u2014N\u2550, L represents the group represented by the following Formula 1a, X represents an unsubstituted or substituted di-alkylamino group, R represents an unsubstituted or substituted alkyl group, and n represents an integer more than 0. Through electrostatic force caused by the voltage, another end of the section can anchor to the section receiver. The at least one node include a representation of a local dynamic model and a parameter set of the local dynamic model. Such method includes determining the viscosity of the fluid based, at least in part, on any pressure difference from such first and second sensing.