I only used it once, but it's relatively simple. Actually I was on the receiving end, allowing a friend in the UK to look at my system. The only 'snafu' was me thinking my computer had gone nuts for a few minutes, before I realized he was controlling my mouse at his end. I had to force myself to just sit on my hands.
He did open a notepad on my desktop and we were able to "talk" back and forth that way. It was cool!