Introduction.
Have you ever visited those Security websites where they have a little window which displays your own C drive files and tell you about your security holes? It is a form of intimidation to portray how vulnerable ones computer is. Here is how they do it.

Basic Code:

The basic code uses an iframe which is not viewable on all browsers unfortunatly:

<iframe src="file:\\\C:\" width="90%" height="200"></iframe>

Result:

The user can now see the contens of his/her hard drive, in this case the C:\ drive.