Hidden lines, not being hidden in 3D view

[deadseasquirrels]

When you have to planes meet each other (perpindicularly) in 3D view, I think sometimes the program (AutoCAD 2002) doesn't understand which plane should be hidden. I have that problem right now, where the plane that should be hidden is exposed when I set it to View->Shade->Hidden.

how do I force the one that I want hidden to be hidden? Does that make sense?

[fuccaro]

Setting the SHADEMODE to HIDDEN all objects or parts of objects covered by others (solids or surfaces) will become invisible. Changing the view point, a visible objects may become invisible (cowered by the others) - exactly like in the real world.
The HIDDEN status does not reffer to a specific object but to the way the image is showed on the screen.
If do you want to hide a specific object, turn off the layer containing that object.