Summary
This lesson examined a server-side implementation of an Ajax toolkit, in the form of XOAD.
XOAD allows the methods contained within PHP classes stored on the server to be made available to client programs using JavaScript. This forms an interesting contrast in approach compared to the client-side techniques discussed in Lessons 19 and 20.
This concludes Part IV of the book and, in fact, the book itself. You should now have a good understanding of Ajax application architecture and the coding techniques on which it is based.
Good luck with your experiments in Ajax!