No 2 USB HDTV Tuner on one machine

I was pretty disappointed to found out that connecting 2 WinTV USB based TV Tuner to a computer does enable Window Media Center to record video using those 2 tuners.  Instead, the old one got ignored and the new one took over when I plugged in an identical second tuner to my closet server.  Interestingly, after reboot, but tuner showed up on the device manager fine.  It's just that Windows Media Center did not use both of them, which is pretty lame.  Guess I will have to use the second one on another machine then.