Tracing (urgent)

I want to generate traces in my application. I'm using Tomcat 4.x.
Can anybody tell me how to do this.
Further, what's the difference between traces and logs.
And how is log4j configured in Tomcat

Anyone please reply. :WAVE:

Ah, too bad I didn't see this post yesterday. Since it was urgent, I won't bother to answer now; I'll probably be too late.