Sorry, but I can't answer the first question regarding "data buffering". What do you mean or expect? Which data should be buffered and where? To your second question: There are two licenses available for three further Web Clients (CL3) and 3 further Handlers (HL3) (= 3 OPC UA connections): R911410796 SWL-W-XC*-WIQ**RUN*CL03**-NNNN     R911410797 SWL-W-XC*-WIQ**RUN*HL03**-NNNN    Regarding licensing there are no limits. So you can buy and acticate as many add-ons on the ctrlX CORE as you like. But I cannot answer how many clients are possible in terms of performance. ... View more