mdnsresponder.exe is a process associated with "Bonjour for Windows" software. It is used by ITunes for music sharing. This is a non-essential process. Disabling or enabling it is down to user preference.
The process mdnsresponder.exe is a component of the Apple Service, which is identified with the Bonjour for Windows software application initially utilized by iTunes because of its music sharing functionality. The mdnsresponder.exe process is a native element of the Mac OS X operating system and is associated with the MDNSNSP.DLL, which was ported for the Microsoft Windows Operating System environment.
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