A tracking shot and a dolly shot (animation on right) have the same effect. A tracking shot moves on tracks and a dolly shot is mounted on a trolley to achieve the effect in the example above. This camera movement is used in a number of ways but is most commonly used to explore a room such as a restaurant. By using a tracking shot or a dolly shot the composer of a film gives the viewer a detailed tour of a situation. It can also be used to follow a character.

From the site below: "Tracking Shot: The camera is mounted on a dolly or truck, and moves horizontally on wheels or railroad-like tracks to follow the action being filmed or to survey the setting."

Tracking a log...

If its an automatic window, then the motors may be about shot. If its a manual window, have the tracking checked, it may be slipping off track.

In the novella, The Pearl, Coyotito is shot by those who are tracking his father. The baby whines, and the trackers mistake him for a coyote. One tracker fires in the direction of the sound in order to stop the whinning. The shot finds Coyotito's head and the baby is killed.