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"Export to an external file all vertex weighting data for a selected model and the vertex weighting data can be re-applied when necessary. This is a quick way to make external back-ups during the skinning process."
This is handy. In a skin modifier - select some verts and press the button. Util goes off and get bone assignments and weights for each vert. Good for fixing blending problems. Also tells you if vert weights are normalized or not.