I have a project for lpc2378 (mcb2370 board) and need to implement a few udp and tcp sockets to send/receive data (client). There is very little explanation for a process of receiving data for tcp / udp sockets in RL-ARM's tcp/ip stack. Often mentioned example LEDSwitch - server is just not present anywhere. Manuals for a lot cheeper tools (= FREE, see for example Wiznet manuals) give a pretty good explanation of processes, including detailed flowcharts. Maybe it's too much to ask for $4000, but I would expect a little bit more from the manual then generally just API functions list.