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| software components | |
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"ActiveX control" is a term used to denote Reusable Software Components that are based on Microsoft Component Object Model (COM). ActiveX controls provide encapsulated reusable functionality to programs and they are typically but not always visual in nature. For example, an ActiveX control might implement spreadsheet functionality similar to Microsoft Excel , which would be visual in nature, but it also might implement functionality to upload or download files from an FTP site, which is not visual in nature unless it incorporates some sort of download progress display or similar. SAFETY AND SECURITY The security concerns associated with ActiveX control is mainly due to the fact that ActiveX controls can do almost anything that a normal application can. Therefore, both malware and useful form ActiveX controls exists; thus the threat level of an ActiveX control can be associated with how trusted its author is. However, there is one famous case of ActiveX controls safety concern: Internet Explorer . Internet Explorer has the ability to run ActiveX controls within a web page. This is both blessing and pain. ActiveX controls like Adobe Reader, Adobe Flash Player, Apple QuickTime Player, Microsoft Windows Media Player, Real Networks RealPlayer, and Sun Java Virtual Machine are routinely used by Internet surfers every hour of a day all across the globe. However, opening a web page that contains a harmful ActiveX control, and then allowing Internet Explorer to run that harmful control, would be same as running a malware on the computer. Fortunately, Internet Explorer 6 and Windows Vista has taken actions to reduce such risks. WRITING ACTIVEX CONTROLS ActiveX controls are simply COM Object s, so they can be written using:
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