Setting classpath -- what to include, and how do you know?

I'm building a test java app to consume a web service. Building it
wasn't that hard*, and it runs fine in the IDE, however I now want to
run it from the command line (windows). How do I set the classpath? Or
to put it another way, what do I need to put into the classpath?



I know I can set the path on the java command and/or in an environment
variable, but what do I need to put there? Adding the webservice client
in WDSC auto-added axis, commons-discovery, jaxrpc, saak, wsdl4j and
commons-logging, but each with a nice long name, and it added them
inside the IDE.



What do I need to include in the command-line classpath to run my java
class on Windows? Then, what will I need to include to run it on i5/OS?



Thanks,

-Walden



*Harder than I would have thought, but I'll write that off to my knowing
how to do it in .NET, and being a novice in Java.