The visibility Out parameters are used only by the current layer, to control how to attempt to see the other layers: 1) All (try to see completely the other layers); 2) Partial (try to see the other layers in a blurred way, to distinguish them from the current layer); 3) None (do not see the other layers).
The visibility In parameters are used only by non current layers, to control how the current layer is allowed to look inside them: 1) All (the layer can be seen clearly); 2) Partial (the layer can be seen in a blurred way, to distinguish it from the current layer); 3) None (the layer cannot be seen from the outside).