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Dear List, Most of the HMIs use VBA (or some other spin off of Visual Basic) as their scripting tool. eg: RSView, Iconics, Intouch, Intellutions etc. SIEMENS, however, offers both of these in two differnt packages: In their HMI/Panel Designer they use VBA but in the Flagship HMI WinCC they use C-Script (or as they call it API-Script), which brings me to my questions: 1) What are the advantages of using VBA over C-Script or vice versa? 2) How come SIEMENS adopted C instead of the un-official (or is it semi-official) VBA for its scripting language? 3) What are the limitations of using VBA and C-Script. 4) What are the future trends towards HMI scripting: would we be getting JScript or some other java based scripting soon. Shahid Chaudhry [email protected]