There's a few key things you can do to constantly check your email and make sure you know when the beta key comes. Let's take a look at them.
That's the magic refresh key. It works on all browsers, and is a throwback to the old days of computers.
Press Control-R or Apple-R
Does the same thing as F5.
Auto check your email every minute
Most email programs allow you to "grab" email off the server as often as every minute. This is how I have my clients setup, and it will more or less let you know as soon as you get an email.