1, for different purposes, the interface calling user returns the interface description interface, and the interface return parameters will appear in the following parameter description. The front end computer verifies the IP address of the router. When using dial-up backup function in WAN, the main link is disconnected abnormally, and the router will enable the backup port.

2. The principle is different. Front-end docking is an aerobic exercise device, which uses legs and arms to drive the flywheel to reciprocate on a circular track. An interface call is a set of named method signatures. Methods, properties and events can be defined in interfaces.