With the supplied Hauppauge WinTV v7.2 application, the HD PVR 2 can be programmed to change the channels on the settopbox using the IR blaster at a designated time.
We then installed the free desktop SlingPlayer software to configure the SlingBox -- you need to choose the IR profile that works on your set-top box, as well as assigning your account email address and a couple of passwords.
In brief, the physical installation simply involved plugging the AV cables (included) into the SlingBox and our set-top box (a Philips Freeview box, to be precise), then taping a couple of IR emitters onto the front of our set-top box, and finally hooking the SlingBox up to our router (via a couple of SlingLink ethernet wall-plug bridges as our router was too far away).