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I looked at the documentation for the UDP read VI, and I believe you are getting error 113 and no data on that first read because the one byte you attempt to read is part of a larger packet. From the documentation of the Max Size control of that VI: max size is the maximum number of bytes to read. The default is 548. (Windows) If you wire a value other than 548 to this input, Windows might return an error because the function cannot read fewer bytes than are in a packet.

Latest version, with a bit of the documentation filled in. It now also works under Mac OS X (it links to the standard copy of SQLite3 included as a part of OS X): SQLite LabVIEW.zip

Basically your Windows desktop is simply an application that is started up by Windows after the user logged in (or it logs in automatically). You can change the registry entry for this to any program you like, including a LabVIEW app. Needs some careful planning ahead, because once you do that, you mostly only can do things in Windows that your application provides an interface for. So if you don't plan some way to startup for instance the file manager, you might have locked out yourself for that account pretty effectively. One exception is Ctrl-Alt-Del which still works, but with some Windows API magic, this is quite easily remedied too. A computer that is tied down like this is pretty hard to get into in other ways than your Shell replacement app, but again watch out, this applies for you too, not just the operator noob.