Opera Help and Support

All browsers keep records of where you have been on the Internet, and even store Web pages and other files (such as graphics) in a local folder known as the cache. Your cache folder can thus contain sensitive information. If you do not want other users to know about certain sites that you have visited, your history may point them to these sites, and your cache may contain local copies of the content of those sites.
If you do not want Opera to store your history, go to Tools > Preferences > Advanced > History and set the number of both typed-in and visited addresses to be stored, to 0. You may also set the cache to "Empty on exit", which means that it will be cleared when Opera is closed.
Cookies
Note that cookies are often used to simplify logins, remember personal information in Web forums and so forth. Such cookies should not be passed on to the next user. The easiest means of avoiding this, is to clear all cookies before closing Opera. This, too, can be automated. Go to Tools > Preferences > Advanced > Cookies and opt to clear all new cookies on exit.
Computer Support and Technical Support will always be provided by Microsoft certified technicians 24x7 ..Live.
More on Opera>>
Security and Privacy on a Shared Computer
Security and Privacy in Opera
E-mail security and Adding certificates in Opera
Levels of encryption in Opera
Shopping and Transaction Security