said by MacLeech:2-way CableCARDs have been available since day 1 of release, it's the EQUIPMENT they're put in that enables or disables it's use. Tivo doesn't make any boxes that can use it.
Cable companies were mandated last year by the FCC to stop buying "integrated security" boxes and have since been buying and issuing "separable security" boxes aka boxes with CableCARDs in them.
I totally forgot about this. Now that you mention it, you're right -- the SA 8300HD box I had did indeed have a multistream CableCARD in it. So obviously the cards are capable of two-way communication.
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