A first window generated by a first application is displayed concurrently with a second window generated by a second application. A first window-movement request associated with the second window is received. In response, the second window is displayed adjacent to and touching the first window and a spatial relationship is established between the first window and the second window. While the first window is linked to the second window, a second window-movement request associated with the first window is received. The first window and second window are moved in accordance with the second window-movement request such that the spatial relationship is maintained. A third window-movement request is received. In accordance with a determination that the third window-movement request is associated with the second window, the first window and second window are unlinked and the second window is moved away from the first window such that the spatial relationship changes.