mDNSResponder.exe is a process associated with "Bonjour for Windows" software. It is mainly used by ITunes for music sharing. This is a non-essential process meaning that it is not needed by the SYSTEM to perform its normal function thus disabling or enabling it is down to user preference. mDNSResponder.EXE as mentioned above is Bonjour system service that implements Multicast DNS Service Discovery for the discovery of services on the local network, and unicast DNS Service Discovery for discovery of services anywhere over the whole Internet. mDNSResponder.EXE was built originally to go with the Mac OS X Platform since Apple produce both Mac OS and ITunes music software. Applications like iTunes, iPhoto, iChat and Safari use mDNSResponder.EXE to implement zero-configuration (zero configuration is explained in the paragraph below) network music sharing, photo sharing, chatting and file sharing, and discovery of remote user interfaces for hardware devices like printers and web cameras. mDNSResponder.EXE is open source, and hardware device manufacturers are encouraged to embed the mDNSResponder source code directly into their products to benefit from zero-configuration networking.
What is Bonjour?
Bonjour service which is a zero-configuration networking system enables automatic discovery of computers, devices, and services on IP networks. Bonjour uses industry standard IP protocols to allow devices to automatically discover each other without the need to enter IP addresses or configure DNS servers. Bonjour is basically like 3 services joined together into one. Specifically, Bonjour service enables configures automatically IP address assignment without a DHCP server, translates domain name to IP addresses without the need for a DNS server (Domain Name Server), and does service discovery without a directory server. Bonjour is an open protocol which Apple has submitted to the IETF. Open protocol means that any software developer can read its documentation or download the source code for it and implement his own version of this service or include it in his application for networks discovery.
mDNSResponder.exe in Windows operating system is usually located in a subfolder of "C:Program Files" or sometimes in a subfolder of the "My Files" folder. The application uses ports to connect to LAN or Internet. You can uninstall this program from the add/remove software feature in the control panel.
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