meaning of icons

[norman]

O
> > I have been trying to find a list detailing the meaning of the various
> > icons used with no success. Some are obvious and some are not. For
> > example, I want to open a file and I am refused. When I look at the file
> > in the folder it has a lock on it. OK, the meaning may be obvious but
> > where can I find out what I need to do to open the file? I tried sudo
> > but that did not appear to work.
>  
> the lock means that only the administrator of the computer can run it.
> you can open the terminal, then type "sudo su" then enter the 
> administrator password
> 
> then through the terminal access the file.

I tried using sudo su and the su was rejected. I tried just sudo again
and again the file would not open. The error quoted was #-2. Does that
help.

Norman