-The easiest way to see this will be to use a tool like Microsoft's Web Services Development Kit (WSDK). You can use the methods and it will pull all the responses. A great test tool.
-Or you can use Codeplex's WebServiceStudio which you can download for free here:
http://www.codeplex.com/WebserviceStudio.
When you open up WebServiceStudio.exe, enter the following URL in the WSDL Endpoint section and click GET:
http://xml.2buypcs.com/services/pcsdealers.asmxFrom here you can click on the method you want to query, enter your user name and password (if applicable), then click invoke. Click on the tab Request/Response for an output of the method.
Hopefully this helps!