The Slide operation changes the position of a window or hierarchy of windows without changing the size. This operation can be visualized as shifting a window without changing its position relative to its siblings. It operation is accomplished by dragging with the middle button pressed.
The Relocate operation is used to relocate a window or group of windows to any position in the hierarchy. The Relocate operation is accomplished by first selecting from the menu and then double-clicking on a border as in the Open operation (Figure 7).
Figure 7: NewMail window is relocated to the top of the OldMail window.