How on earth do you run tests against an existing Tomcat 4 server

Hi all

please can someone tell me how to run tests in cactus against an 
EXISTING tomcat4x server using ant.  I am running

cactus 1.80
ivy 2.0
ant 1.71. 

I have been exasperated in getting to the point where it works by 
creating a new build of tomcat using cargo ???  Sorry if I appear lazy 
but what I am looking for is a sample of how the ant task should look 
for an existing server with the above software configuration.   I have 
tried using the tomcat4x task but now it seems I need to learn how cargo 
should be configured (when the site contains no useful examples) when I 
really am only interested in using Cactus !!!

I really am only a user and I cannot believe how long it has taken to 
get to this point due to the seemingly maze of (undocumented) 
dependencies on beta looking projects that have been put into cactus 
examples/samples.  I am sure I am not the only person encountering these 
frustrations.

thanks in advance

Paul