How to check if a GFWL CD-key is valid?

[valkynaz]

Is there any way to check if the CD-key for a Games For Windows Live title is valid?

I've read that when entering redeemable codes, the screen saying "do you want to redeem this item" only pops up when using an xbox 360.

 

[orderoftheflame]

You can redeem codes through the website as well.

https://live.xbox.com/en-GB/RedeemToken?xr=shellnav