What is User Token useful for ?

There is an article here: http://alt.pluralsight.com/wiki/default.aspx/Keith.GuideBook/HowToGetATok开发者_开发知识库enForAUser.html

It's not clear why I would need it ? Is it for ASP.NET or also Winform ?

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If you need information about the current user or some other user on the system, then yes it is useful. If you don't, then it isn't.

It's like asking why one would need the + operator. Either you need to do addition, and it is useful, or you don't, and it isn't.