Macros can carry malicious code that can disrupt a program.
Research In Motion later issued patches to remove the malicious code.
This could prevent malicious code in an e-mail attachment, say, infecting other programs.
Under American law the transmission of malicious code is in many cases a criminal offense.
Malicious code, "malware", can do shocking damage, destroying machines, starting fires, spewing pollution or jamming communications.
The malicious code has appeared in many countries, notably China, India, Indonesia and Iran.
Malicious code has the potential to cause huge annoyance and disruption.
He reads hacker magazines, swaps information with a small circle of hackers and writes malicious code.
Meanwhile, there is a scramble to write malicious code and spread it across the Internet.
Unlike in other recent cases, the malicious code can be activated simply by downloading the message.
Without this step, malicious code can still rear its ugly head, despite reformatting.
