I noticed that a cookie value ".ASPXANONYMOUS" was written into cookies when a customer hit AspDotNotStoreFront for the first time. When he returns later, the AspDotNetStoreFront read the value from Cookies, and locate the customer from tables.

I need some help to understand this process in a detail way:
-- The value of cookie ".ASPXANONYMOUS" is like "8k-bHuRMzAEkAAAAYjM2M2U1NTctZWJlMC00MDBmLTlhN2EtNDQzN 2M1YjVkOTRlrob5l1rmnw0D6L4wPbBzGVlUPz01" , this is definitely not a customerID or customerGUID or customerSessionGUID. So is this value encrypted?
-- how is this value used to retrieve customerID? From which table, CUSTOMER, or CUSTOMERSESSION? by which column?
-- when is this cookie value being written into Cookies? by which Class/method?

New to asp.net coding and new to this AspDotNetStoreFront thing too. So any advice/suggestion will be greatly appreciated. Thanks!