“Opera Software simultaneously launched Opera 7.21 for Linux
(SPARC, Intel, PPC), FreeBSD (Intel), Solaris (SPARC), and Windows.
New features include less annoying ads in the free
(advertising-supported) version, an ‘undo’ for accidental window
closures, and a ‘kiosk’ mode for limiting functionality on public
computers.“Kiosk mode was first implemented in Opera 6, then discontinued;
it has been reintroduced with Opera 7.21. This customizable browser
setting can limit functionality, blocks menus, prevent downloads,
and adjust other system preferences. It is intended for use by
computer labs, libraries, and other kiosk providers…”