Can I convert one of the regular STBs (set top boxes) into a DVR (digital video recorder)?
No, there is no way to convert the other STBs into DVRs. However, AT&T U-verse WHDVR (Whole Home DVR) allows playback of recorded shows on the DVR from any STB. You can still only pause and schedule recordings on the main DVR until further software updates in the 2010 time frame (Random guess on my part). With future U-verse Software updates you’ll be able to setup recordings from any TV, watch recorded content from any TV, and even pause a recorded show on one TV and finish the show on another TV.