What's a backdoor (trojan) ?

You'll maybe notice that you are not as always quietly connected to the net. Some stranges things happens... :
- somebody access your personnal datas (modify them , claims this , and so on)
- somebody takes control of your PC (softwares start, you cannot manage the mice, and so on)
- your antivirus informs you about a trojan detection

Most of the time, as for computer virus, you'll be your own victim, being to confident with any source or using unknown origin softwares. And against your wishes, some "clever" guys will success gaining accesss to your computer, maybe sometimes with the standard configurations (such as printer/disk shares).

Using trojan is not very often done. But, don't be too optimistic and ignore this problem, it can be a high risk for your computer...