From Seo Wiki - Search Engine Optimization and Programming Languages
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A helper application is an external viewer program launched to display content retrieved using a web browser. Some common examples include Windows Media Player and QuickTime Player for playing streaming content.
Unlike a plugin(whose full code is included into browser code), a small line is added to the browser code to tell it to open a certain helper application in case it encounters a certain file format.
- ActiveX control
- Object Linking and Embedding
- Overlay (operating system)
- shell script
- Video player (software)
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