When you purchase a game on Steam, you are provided with a CD key. This CD key is used to verify that you own the game. If you ever lose your CD key, or if you want to give the game to a friend, you can use the Steam query account by CD key feature to look up your CD key.
To use the Steam query account by CD key feature, open the Steam client and click on the “Games” tab. Scroll down to the “CD Keys” section and click on “View CD Keys”. This will open a new window …