Question regarding evaluation license of ESX 3.5

Probably the question has been asked 1 million time but I can not find any forum entry 100% answering my questions, so I as here.

I registred for an evaluation license of ESX 3.5. As soon as I did that I got a mail from VMware with the information where to download ESX 3.5 and some other additional applications. The mail told me to press a button in order to get the evaluation license activated. It mentioned something about expiring. Now my question:

Regarding the expiring: What is expiring?

1. The download link?

2. The downloaded applications?

Regarding the evaluation period:

1. How long is the evaluation period?

2. How is the evaluation calculated?

1. x days after installing the VMware ESX 3.5 will expire?

2. The downloaded application is already hard coded to expire on a certain date?

3. What about an evaluation serial? Is that not needed? (I did not got one or I overlooked it. Do I need one? If so, where to get one?)

All the other questions I had where responded by searching the forum and reading the posts and responses of other users.

// Steve