R help - Aug 2004 - Question about NPMC

Hello all,
I plan using the NPMC procedure and now I am wondering if this is equivalent
to the "Steel-Dwass test" found in the KyPlot program. The author of
KyPlot cites

Steel, R.G.D: A rank sum test for comparing all pairs of treatments.
Technometrics, 2: 
197-207, 1960.

and

Dwass, M.: Some k-sample rank-order tests. In Contributions to Probability
and Statistics (Eds I. Olkin et al.), Stanford University Press, pp.198-202,
1960.

for this method. Is it the same test or are there any differences?

Thanks a lot
Judith Baltsar