The line at the bottom of the frame (below the mode line) is the echo area. Emacs uses this area to communicate with you:
Find file: /usr/lib/x11/
Now you need to give a file name to open, for example if the file name is myfile, you will type myfile after /usr/lib/x11/ and press the Return key. If you pause for more than a second while typing, you will see the characters that you type in the echo area.
error→ Opening directory: no such file or directory, /urs/lib/x11/myfile
This error message will be accompanied by a beep. Some SXEmacs commands will print informative messages in the echo area. See The Echo Area in SXEmacs User’s Manual, for more information on the echo area.