i don't understand, you're only sharing with one person? isn't that perfect VNC territory? both people can control the screen, it's free, it's open source, it's

i don't understand, you're only sharing with one person? isn't that perfect VNC territory? both people can control the screen, it's free, it's open source, it's cross platform... what am i missing? what's fundamentally bad about this that no one else has mentioned it yet? maybe i'm just behind the curve on this.