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ActiveX is a Microsoft technology also known as OLE (Object Linking and Embedding) whose primary function is to facilitate the integration of multimedia content on a website. ActiveX, or ActiveX Controls are used on a daily basis by almost all internet users, the most prominent examples are Acrobat Reader, Adobe Flash Player, RealPlayer and Apple QuickTime.
The security concerns with this technology are due to the fact that ActiveX can do almost anything a program you would run on your harddrive could do, so the potential threat when downloading ActiveX elements from a website you don’t know or trust are high. Running Internet Explorer 6 or more recent versions helps minimizing the risk, so does downloading ActiveX controls only from websites you trust.