To participate in the Team Fortress 2 open beta, all TF2 owners need do is download the beta from Steam. Once downloaded, players will gain access to the first beta build, featuring three different new versions of Natascha, some map tweaks, and a change to the hit-scan weapons effect the movement of players being healed by medics.
If any of that sounded important to you, hit up the link below for more information on participating in the Team Fortress 2 public beta.
Prepare for your examination! [Team Fortress Blog - Thanks Sweeper!]
[Source: Kotaku]