Off the heels of our last major upgrade to Collab Mode, we have a minor upgrade for you: new user labels! The idea is that instead of just different-color cursors indicating other users, you'll see a label that says exactly who that is.
Also notice the line number indicator in each editors header that let you know where the are, in case their cursor is out of view for you. Heads up that isn't always 100% reliable as sometimes CodeMirror doesn't even render the lines that are out of view for efficiency. But if their cursor is there at all, you'll see the line number and indicator.