Computer to Satelite? Using what technology? Echelon keeps track of all traffic, but thats because its using technology through the telephone lines such as broadband etc...
The only way that could work richard, is if there's a Van with personnel outside of your house pointing a receiver at the TV/Monitor, Monitors/TVs respond at certain Hertz, for PC's they operate between 60hrtz and 70hrtz, its the screen refresh rate, THIS can be viewed remotely if a receiver is pointing at the monitor/TV...however this has to be closely monitored, and not a distance of a satelite
I'm only going with current technology 'known', of course, they're way more advanced, so technically anything is possible...