Regarding ..."We tested a web client prototype to check data entry performance, but even with AJAX it could not cope with the heavy data entry loads required", can you expand on the type / amount of data entry to which you refer? We have a new development contemplated, and heavy data entry requirements is one of our concerns in trying to decide between smart client and thin client. FYI, 90% of the users will connect via LAN with the rest connecting via the web.