unless it has an IR blaster to change cable box channels, you're out of luck
DTA's are better than cable boxes as everything over starter/standard tiers are SDV which shuts off the channel after 4 hours of inactivity (it checks to see if you're still home, lol)
"Press any key to keep watching this channel"
many Slingboxes do come with IR blasters, but I have no idea if it will know the IR codes for the TW DTA...
sadly, the Magnavox DVR does not have an IR blaster.
more and more its looking like Hulu... but I gather that cable/content companies are upset with Hulu and will likely change the availability/cost of TV shows on Hulu... (people wonder why monopolies are bad...)