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.
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