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Sample Download : http://code.msdn.microsoft.com/How-to-request-a-Token-5e37c6bf

When your web applications and services handle authentication using ACS, the client must obtain a security token issued by ACS to log in to your application or service. In order to obtain this ACS-issued token (output token), the client must either authenticate directly with ACS or send ACS a security token issued by its identity provider (input token). ACS validates this input security token, processes the identity claims in this token through the ACS rules engine, calculates the output identity claims, and issues an output security token.

 This topic describes the methods of requesting a token from ACS via the OAuth V2 protocol. All token requests via the OAuth V2protocol are transmitted over SSL. ACS always issues a Simple Web Token (SWT) via the OAuthV2 protocol, in response to a correctly formatted token request. All token requests via the OAuth V2protocol are sent to ACS in an HTTP POST. You can request an ACS token via the OAuth Vprotocol from any platform that can make an HTTPS FORM POST: .NET Framework, Windows Communication Foundation (WCF), Silverlight, ASP.NET, Java, Python, Ruby, PHP, Flash, and other platforms.

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