rob:
campden = potassium metabisulfite (or sometimes sodium) = K-meta (or Na-meta)
milkman:
sometimes first racking is before fermentation is complete, and fermentation will be completed in the carboy. Since campden/K-meta will stun yeast and will slow (and perhaps inhibit) the completion of fermentation, do not add it until CERTAIN that fermentation is complete.
Steve