Define here the layer visibility to the outside and to the inside.
Visibility
The 
Out and 
In parameters control the visibility 
to the outside and to the inside of the various layers in a window. 
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).