I've used it (on redphive.org servers) and it most certainly works.
ALTHOUGH, with the redphive servers, if you get kicked for not having CD on, then you'll have to manually rename yourself (after you exit and start up CD) IN THE READY ROOM (to remove that [No-CD] tag). I'm not sure if it's a bug with Steam, or CD, or redphive.
Comments
no it isnt part of steam.
no it isnt required (unless the server admins make it required).
VAC support is built into Steam, you can try CD, it will probably work fine
ALTHOUGH, with the redphive servers, if you get kicked for not having CD on, then you'll have to manually rename yourself (after you exit and start up CD) IN THE READY ROOM (to remove that [No-CD] tag). I'm not sure if it's a bug with Steam, or CD, or redphive.
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