From Hauppaugge's web page at
http://www.hauppauge.com/site/produc..._hvr2250.html:
"If you have a digital cable set top box or a satellite box, you can connect via either Composite or S-Video inputs. Channel changing will be done using the IR blaster. The WinTV-HVR-2250 has two Media Center compatible IR blaster outputs for controlling two cable TV or satellite set top boxes."
I'm recalling that my HVR-2250s came with everything needed to control and connect to two set top boxes.
Also, see "Connecting an external Audio/Video source" on this page:
http://hauppauge.lightpath.net/manua...-kit-v1.4b.pdf