ASP.NET what is the meaning of AutoEventWireup and Inherits?

Given the following statement,

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="XXX.aspx.cs" Inherits="XXX" %>

1. What is the meaning of AutoEventWireup?
2. What if the value of AutoEventWireup is equal to false
3. What is the meaning of XXX in the Inherits attribute?
4. I cannot find the definition of XXX in the auto-created file in ASP.NET 2008. Where is the XXX defined?

Thank you