Thank you Cheval.  From a careful reading of the messages identified, it
seems that we may not be able to use data 'pens' successfully.  However,
there is a slight difference in our set up - we use a separate data 'pen' for
each separate desktop that is in the system so any one pen is only ever
synch'ed with the Master and a single other PC, does this make any
difference?
You recommended to 'Rob' that he either sets up a LAN or uses Indirect
Replication; neither of these is available to us - the first because our
staff have remote desktop machines, the second because we don't have
Developer Edn. of Access = no Replication Manager = no Indirect Replication I
think.
Alternatively, is is possible to clear the list of 'known replicas' and set
up fresh copies now and then to avoid the 'list full' issue?
Again, many thaanks for the advice.
Gavin.