R help - Nov 2006 - Nemenyi test for two way layout data.

I am trying to do a Nonparametric Nemenyi test for multiple comparison in a two
way layout data because I need to know the exact distribution. I don?t know if
this test is in the R software. I just found a Nemenyi test for a one way
design. But in Hollander book the Nemenyi test is in page 253 for to way layout
data.
Thank you for your help.