The Cellular Overview with Four Tooltips Opened. The Cellular Overview with four tooltips opened. A tooltip opens up by mousing over or by left-clicking an object icon. Tooltips can be repositioned or closed by the user. A tooltip closes automatically unless the user has clicked the button "keep open" (not shown) in the title bar of the tooltip. Web links are also provided in a tooltip to enable the user to display more data about the object or related objects.