Something has to "serialize" the process. This can be by explicit agreement as to whom, what, where, when, and/or how; or a computer process that only allows one of the list-owners to signon to (whatever) at a time. This subject has been discussed many times and there are a variety of answers already provided that might be just what you need. Therefore, I suggest some searches of the LSTOWN-L archives for various discriminators e.g., SEARCH MULTIPLE OWNER IN LSTOWN-L as a first pass. -- co-owner: INFOSYS, TQM-L, CPARK-L, ERAPPA-L, JANITORS, LDBASE-L, et -L URL:mailto:[log in to unmask] "I get paid by the millisecond"