Thanks Guy, Hugh & Tom for the replies. > -----Original Message----- > From: ts [mailto:decoux / moulon.inra.fr] <snip> > > use #read and #write rather than #puts #gets This did the trick! It also forced me to revisit structs/constants for extensions as I now get "uninitialized constant" for ProcTableStruct in the client (but not the server). I think someone already posted the solution for that, so I'll go back and track it down now. :) Thanks again. Dan