.net 2.0 concurrent problem

Hi,
I'm using a .net 2.0 web service, I want to know the default concurrent process in .net 2.0's web service.
I only can find .net 3.5 and 4.0's default. Also can anyone tell me how to set the concurrent process at .net  2.0 , i can't find how to set it.
I just found how to set  maxConcurrentCalls, maxConcurrentSessions, maxConcurrentInstances at .net 3.5 or 4.0. but this is not work at .net 2.0.

Thank you.