I'll reword the Option list: Exactly what does the BL connect to directly (that the user can see)? A. Only BL and PL nets A1. Option A, but BL nets are transparent B. Option A, plus a couple nodes such as documents and containers C. Anything I say we go for Option A1. Cheers. Jeff -- +----------------------------------+ | J.W. Bizzaro | | | | http://bioinformatics.org/~jeff/ | | | | BIOINFORMATICS.ORG | | The Open Lab | | | | http://bioinformatics.org/ | +----------------------------------+