The web app I need to test has a constraint that is a real problem for load test tools. Only one instantiation of a custom ActiveX object can take place at any time on any machine.

It is my belief that all the automated tools use some sort of "virtual machine" approach in order to simulate multiple users. I have tried WebLoad, but I would need 1 machine per "virtual User" because of the ACtiveX control constraint.

So my questions are: Has anyone dealt with this type of problem before?
Can anyone suggest or guess a solution?

I tried terminal server, but the ActiveX control still can't exist with other instantiations.