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The Addons section of a-squared HiJackFree allows you to view and edit plugins and addons of the Windows Explorer and Internet Explorer. Addons are mainly Browser Helper Objects (BHOs) which extend the functionality of the browser or additional Toolbars.
The LSP section shows all installed Layered Service Providers (LSPs) which are some kind of network drivers. Some Spywares use LSPs to add advertisings to the web data stream of the webbrowser.
The Hosts file contains the mappings of IP addresses to host names. This file is loaded into memory at startup, then Windows checks the Hosts file before it queries any DNS servers, which enables it to override addresses in the DNS.
You can use the Hosts file to redirect ad network server names to localhost to avoid ads on websites. Another 'feature' of the Hosts file is used by worms. Many of them use that file to redirect all requests to websites of Antivirus companies to localhost to avoid removal of the worm.
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