Z-order is an ordering of overlapping two-dimensional objects, such as windows in a graphical user interface (GUI), shapes in a vector graphics editor, or objects in a 3D application. One of the features of a typical GUI is that windows may overlap, so that one window hides part or all of another. When two windows overlap, their Z-order determines...
Found on
http://en.wikipedia.org/wiki/Z-order
The order of 2 dimensional objects along a notional z axis,
details ...Found on
http://www.cryer.co.uk/glossary/z/index.htm
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