FvwmCommand WindowList - get layer information

I'm trying to get information about running windows with all the information that is shown in the menu of "FvwmCommand WindowList " output. (Redhat Linux 7) The problem with this command is that it shows a pop-up menu, instead of printing the output on console. The alternative I found is wmctrl . wmctrl -lG # Prints most of the information as FvwmCommand WindowList However, it does not give "layer" information. Per help page for "FvwmCommand WindowList": > The format of the geometry part is: desk(layer): x-geometry sticky, where desk and layer are the corresponding numbers and sticky is empty or a capital S wmctrl -lG gives information about desktop, but not the layer. Is there any way, I can get layer of particular window (windowId)?