I don't understand your question. In and out points of footage layers are clearly visible, pressing the "u" key will reveal all keyframes for all animated properties, the work area bar at the top of the time line has colored pillars at the start and end points.
Try and give us a little more information.
You're referring to the work area. If you do a RAM preview, it will preview just the area between the start and end of the work area, unless you have From Current Time enabled in the Preview panel.