This sample shows how to authorize access to Windows Communication Foundation applications in B2B scenarios using federated security protocols. 

I want to access your service.  Your service is configured so that it will only process requests incorporating a security token issued by your company’s security token service.  Because we have a business partnership, your company’s security token service is configured so that it will issue security tokens in response to requests that incorporate security tokens issued by my company’s security token service.  So, my application, by which I access your resources, is configured so that it knows that in order to access your resources, it must first get a security token from my company’s security token service, and use that to obtain a security token from your company’s security token service.  That security token issued by your security token service can then be used to request access to your service’s resources.