Color displays with 3D map overlays enhance the situation awareness. The backdrop provides clear differentiation for pushpins, labels and red, yellow and green traffic overlays. This vapor is trapped in the interface between the transparent and opaque overlays. A softer material made of bark strips that are sewn in overlays would be prepared. Games came with color overlays to compensate for the monochrome screen. The map overlays indicated the trajectories of various objects in geographic coordinates. DirectDraw allows direct access to video memory, hardware overlays, hardware blitters, and page flipping. Static communication devices have symbols in fixed positions on paper overlays, which are changed manually. Often linkers provide support for overlays. In this application they are known as PCO Polyester Concrete Overlays. Games were shipped with plastic card overlays that snapped in over the keypad. Planes were developed to represent hardware overlays supported by the scanout engine. It overlays the wood and consists of the inner bark and the outer bark. The holographic overlays attracted a lot of attention. MapQuest overlays OpenStreetMap data perfectly as well.