WCF hosting

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IIS

WCF

I am working with WCF and hosting services in IIS.

Since long I have two questions that seems to trouble me:

1-When a service is hosted in IIS using a .svc file, how does it know which message exchange pattern is being used like duplex or request reply.Say I use duplex and give wshttbinding then the svc file will generate error on browsing it by doing a right click and selecting view in browser.So how does it detect which MEX is being used in the service as it knows only the endpoints I believe.
Please guide me.

2-What process happens when I right click on the .svc file opened in Visual studio editor 2008 and select View in browser. I know it does show the hosted service and we can see the WSDL if the settings and build is proper but what does it do in the background; what all process occurs behind the hood.

3-How does the service get hosted when we have a svc file, what is the actual use of the svc file and which file is read first the SVC or the web.config file when a hosted service is called and when a service is hosted.

thanks to all