Half Life CD Key and Counter Strike WON ID (dont worry, this isnt warez)

[Ripper]

Hi.
Dont delete this post because it is not Warez!!
I want to copy Counter Strike onto a CD and give it to my friend, who already has HL. (dont worry, Counter Strike is free, so this is not Warez)
My question is, does Counter Strike use Half Life's CD Key to get online or does it just use the WON ID?
Also, how is the WON ID assigned to the client? Or does a WON ID come with every counter strike downloaded?
Thnaks, any help apreciated