This project has a reference to Releye.Common.BusinessLogic which contains the following classes:
	BusinessLogicBase

You can read more about the methods included in the above mentioned classes in the Object Browser.
You find the Object Browser under View in Visual Studio ribbon.

If you would like to add or change stuffs to any of the classes mentioned above, you should do that in the Releye.Common.TemplateSolutionProject found in the 'Releye Components' project.
Please see the Wiki for more information.