shaded view & selecting vertices on both sides??

The Z key toggles between transparent and shaded view. Why can I still see (and select) vertices on the other side of a mesh in shaded view? I need to prevent accidental selecting of the other side of a mesh at times.

thanks

Beside the vert, edge, face buttons in the 3d window header is a button with a box icon – press it.

GreyBeard

Thanks GB…even after working with Blender for many months, never knew about that one. I recognize your name from several great video tuts you have done. Are you working on any more?