<A target="_blank" href="http://hermes.intec.co.uk/intec/blog.nsf/dx/28072010135429HERH64.htm">Paul Withers started using XPages about a year ago. In the process</A> he found he also had to learn about Expression Language (EL), Server Side Javascript (SSJS), and Custom, so he's written up some explanations to help you get up to speed.