Hi yall - - - Im pretty new to OS X and Unix, so Im not very good at knowing where to lookup information yet. In terminal a couple of days ago I had used cat to display the contents of a file which I have been editing frequently with vi. After being distracted for a few minutes I glanced at the screen, assumed that I was in vi, and hit ESC twice as a prelude to exiting (to ensure that I havent overlooked the - - INSERT - - at the bottom of my screen). When I didnt get a bell, I finally really looked at the screen and saw that Id been at the command prompt with the ESC ESC and was now being asked: Display all 1241 possibilities? (y or n) I didnt want to respond with a y because I didnt want to start something that would take forever to complete. What does ESC ESC mean, and more importantly, how should I have looked this up - - system docs? Online? OReilly books? Thanks, -Nick T.