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__Stencil Buffer__ - An on-card buffer that is used for special effects involving ((-Pixel Shader))s. The stencil buffer allows certain ((flag))s to be set on a per-pixel basis that are then read at the last stage of rendering and used as keys for pixel shaders.

A decent explanation is at the bottom of the page here: 
[http://www.beyond3d.com/content/articles/41/]

Stencil Buffer Tutorial:
[http://developer.nvidia.com/object/Stencil_Buffer_Tutorial.html]