So a friend of mine has a Hewlett Packard HTPC that he has been using as his DVR for the last two years. Hooked directly to the Comcast cable line. Recently Comcast told him that he will need a box for the HTPC. This is fine with him, except he doesn't know how to get the HTPC to change the channel on the box, for his scheduled recording while he is away. Of course Comcast's answer is they will rent him a DVRWhat are some solutions to this problem?