xdmcp

hi
I have around 9/10 machines in linux used for
computation
now we use xdmcp protocol for allowing any machine to
connect to any other machine on which a particular
user may have account.
       Problem is with newly added RH 9.0 machines
that they are showing the other machines in xdmcp manu
but not themselves. so the xdmcp menu we get here on
all machines is still with old list.
  HOw do i make sure that the newly added machines
show up in the xdmcp menu?

mail me cc of the reply
rgds 
upendra

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