A method of connecting servos to the control points with two connections, one on either end of the servo connection / control connection. This allows the servo to push a connection on one end and pull the connection on the other end. Th is is used to fight slop and use the servo power more effectively by "balancing" the pivot point.
With a Web browser, users request a resource from a Web site, which then is delivered by a Web server. In other words, users pull a resource. Recently, push services have been added to the Web that actively push personalized resources to the users. For example, the ticker you see when entering SAPNet is an example of a very simple push service pushing share price information to your desktop. More sophisticated push services are available on the Web and are typically delivered via channels.