This is what my SC2 Beta Invitation looked like
On a side note keep in mind the first few waves of invites don't have codes. It is just in your account.
StarCraft® II: Wings of Liberty™ Beta Test – Invite a Friend
Congratulations! This is an additional invitation to the beta test for Blizzard Entertainment’s StarCraft® II: Wings of Liberty™ for you to share with a friend! You are receiving this email because you are currently participating in the StarCraft II beta test, and we want to encourage you to test out some of the social features of the revamped Battle.net® online-gaming service by inviting one of your friends to play with you. This email contains your additional beta key for you to send to a friend, along with instructions to help your friend get started.
This key can only be used once to upgrade a Battle.net account to participate in the beta test, and while we encourage you to share this key with someone you know, it must not be traded or sold.
Once your friend has joined the beta test, be sure to add him or her as a Real ID friend by opening your friends list in the bottom-right corner of the Battle.net interface and selecting Add Friend. Enter your friend's Battle.net email address in the Real ID Friend field that pops up, and then send your request. Once your friend accepts the request, you’ll be able to communicate more easily, quickly join parties together for some team-based 2v2 games, and more.
So what are you waiting for? Send this beta test invitation below to your lucky friend and start playing some exciting team games!
Beta Test Invitation:
As a beta test participant, you’ll have the opportunity to experience the multiplayer gameplay of StarCraft II: Wings of Liberty and explore the social-networking, matchmaking, and other new features of Blizzard Entertainment’s revamped Battle.net® online-gaming service. Throughout the StarCraft II beta test, you’ll be able to take part in cooperative and competitive battles as the terrans, protoss, and zerg -- and at the same time, you’ll be helping test the stability of the Battle.net service and fine-tune the game balance prior to launch. The developers look forward to hearing your feedback and seeing you on Battle.net!
Below is a beta key that will allow you to upgrade your Battle.net account to participate in the StarCraft II beta test.
PLEASE NOTE: Each beta key can be used only once, so please make sure you are upgrading the Battle.net account you wish to use to play the StarCraft II beta. Once claimed, your beta key cannot be transferred to another Battle.net account.
1. Apply Your Beta Key - Log in to your Battle.net account. Under "Manage My Games," click "Add or Upgrade a Game." Enter the above beta key in the "Enter Game Key" field and select "Add Game."
2. Get the Installer - In your list of games, click the “Manage Game” button under the StarCraft II beta image to download the installer.
3. Install the StarCraft II Beta - Once you’ve downloaded the installer, run it and follow the directions to install the StarCraft II beta client on your machine. Note that your participation in the StarCraft II beta test is governed by a Beta Test Agreement that you are required to accept before you can install the beta client.
4. Run the Game & Log in to Battle.net - After the StarCraft II beta installs, the launcher interface should automatically appear on your screen. Log in with your Battle.net account and you’ll be able to begin playing. You can launch the client at any time by clicking the desktop shortcut or by going to the Windows® Start Menu.
Any questions? Check out the FAQ.
Please retain this email for your records. If you experience any issues setting up your Battle.net account, please contact Blizzard Entertainment Account Services via webform at https://us.blizzard.com/support/webform.xml?locale=en_US
or email at firstname.lastname@example.org.
Once you’ve had a chance to play, please share your feedback by posting on the StarCraft II Beta Forums. The game is still a work in progress, and one of the purposes of the beta test is to identify any issues and improve the player experience before the game ships. The developers encourage you to report any in-game issues you experience via these forums.
If you run into any difficulties installing the StarCraft II beta client, please contact Blizzard Entertainment technical support either by posting on the appropriate forum at http://forums.battle.net/board.html?forumId=25352527&sid=5000, via webform at https://us.blizzard.com/support/webform.xml?locale=en_US
, or by email at email@example.com.
** IMPORTANT ** To avoid graphical bugs and other technical issues, please ensure your video card drivers are up-to-date.
Enjoy the game!