Our political system has been infected with a Trojan Horse, a very common yet difficult to rid of computer virus. This is the type of virus that attempts to make the user think that it is a beneficial application. Trojans are known to create a backdoor in your computer that gives malicious users access to your system, possibly allowing confidential or personal information to be compromised. One can well imagine the damage unless you have a sound defence mechanism in place. We have to raise our security level. -KHURAM KHAN, Lahore, via e-mail, December 18.