Question about game activation on steam.

I want to buy a retail STEAM game and I have a question. During the installation, do any prompts pop out asking me for the serial or do I have to activate it using the option?

I want to buy a retail STEAM game and I have a question. During the installation, do any prompts pop out asking me for the serial or do I have to activate it using the option?

kerk12

When you press "Activate a Product on Steam", you need to enter the CD Key. After that, it just installs by itself.