Once downloaded on a user's computer, the ActiveX control becomes a part of the operating system with the ability of tampering with every piece of hardware and software on the machine. For example, Java applets can't erase files from a user's hard drive. Java applets, which perform many of the same functions as ActiveX controls, are heavily restricted as to how they interact with a user's PC. The issue with ActiveX, security experts say, is that Microsoft gives the individual user too much responsibility in patrolling their PC security. Many of the past decade's most infamous computer viruses, spyware and adware programs came disguised as ActiveX controls. The same things that make ActiveX so useful - its flexibility and integration between all applications - make it particularly dangerous in the hands of malicious hackers. Hackers can use activeX to cause computer viruses such as the "Iloveyou" worm.
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