http://www.alphatecit.com.au/code-snippets/facebook-c-sdk-multiple-login-problem-resolved/

INTERNET_OPTION_END_BROWSER_SESSION
42

Flushes entries not in use from the password cache on the hard disk drive. Also resets the cache time used when the synchronization mode is once-per-session. No buffer is required for this option. This is used by InternetSetOption.

http://blog.prabir.me/post/Facebook-CSharp-SDK-Writing-your-first-Facebook-Application.aspx

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