I'm creating a web site for my company that will act as a kiosk in our showroom.
*Customers will NOT be able to use a keyboard or mouse because we've purchased touchscreen computers.*

I would like to include links to other websites but the concern is customers will not be able to navigate back to the kiosk menu. Is there a way to circumvent this? A computer application perhaps, or some sort of button that maintains a presence on the screen?

Note: The web page is designed for viewing only on our computers in the showroom, so we can make any changes to the computers themselves to fulfill this goal.