Read original post by Michael Washington at LightSwitch Help Website
The LightSwitchHelpWebsite.com is an ASP.NET Web Application that currently has four LightSwitch applications integrated into it (you can access them from the DEMOS tab). The integration means that a user will have Single-Sign-On between the ASP.NET Website and the LightSwitch application. This integration has been covered in the article: Easy DotNetNuke LightSwitch Deployment.
However, it may be helpful to cover the steps for integration using a simple ASP.NET Web Application rather than a large complex application such as the DotNetNuke application that the LightSwitchHelpWebsite.com uses.