>> Writing an HTTP server is one of the most simple thing to do so. I thought that the goal here was to write the GUI in HTML5 itself (HTML5 ha= s 'programming' capabilities, making it (for example) a competitor to Adobe= Flash) ? Writing a server-based GUI using other tools is a different kettle of fish. I don't know HTML5 from Flash From cgi, but you could look at http://codebe= nder.cc/ I think it does something along those lines (for Arduino code)=85 (And there's mBed for ARM as well.) BillW --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .