Has the option of changing TV Channels from a computer, been taken away ??? Why ????
At this time only hand-held phones/tablets by apple and android can run the Xfinity TV Remote app. A desk/laptop can not natively run the apps. There is a whole thread about the change at http://forums.xfinity.com/t5/TV-App/UPDATE-XFINITY-TV-App-and-Portal-Replacing-XFINITY-TV-Go-App-and...
the devices are portable computers among other functions.