Steam + old Half-life

If I buy this copy of HL1, will it attach to my Steam account and let me download it/ launch it from Steam?

In Steam (at the top left corner)

File - View - Games - Help

Click Games

Then activate a product on Steam...

Type product key.

Enjoy

In Steam (at the top left corner)

File - View - Games - Help

Click Games

Then activate a product on Steam...

Type product key.

Enjoy

NintendoGangsta