• Usage - Press the "Enter" or "Return" key; in sector, surface, edge, vertex, thing, or light mode, opens Editor window for that mode.
• The Layer is a feature for only .jed files; .jkl files do not support them, but they are still useful. Layers are used to set certain objects visible or invisible. This can be very helpful if you are working on a very large level that has several different parts to it. In the Map Settings window, you can select which layers are visible and which are not.

This is where you enter the Layer name.