Using Fiddler to see requests that a proccessed on another machine

[Test]

I have clinet which is talking to a TestWCFService. This
TestWCFService inturn talks to another ExternalWCFService

I want to mock the response that comes from ExternalWCFService to
TestWCFService.
I would like to see these request on my client machine. Let me know if
there is way to do this.

[EricLaw]

No, a client cannot simulate server-to-server traffic solely on the
client. (Imagine how scary it would be if you could!)

If you have access to the computer running the TestWCFService, you
could run Fiddler on that computer to simulate the responses from the
ExternalWCFService.