Domino Web Access question?

Hi,

Sometime, for a user, the “Logout for Shared PCs or Kiosk Users” is not showing"!!!

In the Administrator help, they are saying that “The removal of private data from the browser’s cache and more secure data clearing capabilities are available only if the user accepts the Domino Web Access control.”

What is Domino Web Access control?

Where does the user need to accept to always see the “Logout for Shared PCs or Kiosk Users” is not showing"ptions?

Thank you!

Alex