How to control a buddy's screen when screen sharing in Messages?
I need to help some relatives with their Macs but I'm having trouble with screen sharing. Why can I no longer control a buddy's screen in Messages? I only have the ability to magnify an area on their screen. I am using El Capitan on a 27" iMac. The people that I am trying to help have Yosemite on MacBook Pro's.
iMac (27-inch Mid 2011), OS X El Capitan (10.11.2), null