This outher guys is correct but he forgot to tell you that it will close the program as well as saving every drawing that is open. If you are in the trim or extend commands instead of clicking a line / or more then one line you can just press space bar or enter and will use every line as a trim as a trim line or if you are in extend the it will use every line as an extent to line. I have lots of those that i can show you but there are to many to list. If you wont research on lisp routines. You can create your own commands and even your own buttons.
