Today we're going to take a look at the Basics of Browser Helper Objects (BHO's). We're not going to cover BHO's and Security in this post, that will be covered in our next post on BHO's. First off, what is a BHO? A BHO is a DLL module designed as an extension to Internet Explorer by allowing customization and added functionality. BHO technology was introduced back in 1997 with the release of Internet Explorer 4.0. Applications that install BHO's are popular because they allow the application developers to provide features and customizations that enhance their applications. For example, the Windows Live Toolbar (shown below) includes a Browser Helper Object (Windows Live Sign-In Helper). This BHO is a control displayed when you try to log into Windows Live services and helps you log in with multiple Windows Live ID's on the same machine.
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