YM INVISIBLE DETECTOR - You can appear in Yahoo Messenger chat rooms with no name via the "Invisible Nickname" trick. Click the "Edit Profile" option in the main Yahoo Messenger menu. In the "Nick Name" field, hit the space bar, then click "Enter." Alternatively, depress the "Alt" key on the computer keyboard, followed by the numerals 0160 or 255. Click "Save." Enter a Yahoo chatroom to appear with no nickname.