title: Set Application Expiration Date
body: <p>I have a VB.NET application that I would like the user to be able to run for a fixed period, then have it switch to a partially restricted mode. I have the code in place to do that, as well as code to encrypt data. What I need is to be able to track the date the application is first used. And have the date saved somewhere and in a format that the user is not likely to be able to reset it. Is there a preferred way to do this, such as some obscure Registry key?</p>