[Webtest] Parallel stress test (load measures tests)

[Kalosandros]

Hi all,
please, have anyone any suggestion about the best way to do a stress 
test, by many parallel execution of (hundred of) a request to  a web 
application with Canoo Webtest?
What may be the best strategy? How could I have a summary report of the 
whole suite?.
I think to try some feature at ant-level in script (maybe <parallel> 
task), but I suppose there would be some better strategy at Webtest-level.
Thank you in advance.
Best regards,
Vito