Sometimes i would like to see the screen of a computer used by a persons we work together on a number of projects. I want to connect to it, not without his knowledge. mostly because maybe I need to show him how to work on a certain web page in out project. Over telephone I'm saying one thing and they are seeing something else and we are so slow. What tools out there can help us share screens without eating too much of our internet and not blasting us with ads, malware or just being dysfunctional 'free' trials. free is better. we are on Windows machines 7+
my internet is very good (ADSL silver), theirs is an Ecoeb 2.5G dongle. not very good