About Bonjour
The Bonjour for Windows package provides Bonjour zero-configuration networking services for use by Windows applications such as iTunes, Safari and AirPort Utility.

Bonjour enables computers and devices to automatically discover each other using industry standard IP protocols without the need to manually enter IP addresses or configure DNS servers. It is particularly useful for connecting to devices such as the iPhone, Apple TV, and AirPort base stations.

System requirements
Bonjour for Windows supports Windows 7 or later.
Use Windows Update to make sure you have the latest Service Pack installed for your computer.

Firewall requirements

The Bonjour networking protocol sends and receives network packets on UDP port 5353. If you have a "personal firewall" enabled, you will need to ensure that UDP port 5353 is open for Bonjour to work correctly. Certain firewalls will only partially block Bonjour packets, so if you experience intermittent behavior, check the firewall settings and verify that Bonjour is listed as an exception and is allowed to receive incoming packets. 
The Bonjour installer will configure the Windows firewall appropriately during installation on supported systems.
Known Issues
A small number of Virtual Private Network (VPN) clients interfere with Bonjour. If you find that you can no longer discover network services, try logging out of VPN.
More information
Bonjour is commonly installed by third-party software to provide zero-configuration networking capabilities to various applications.
Developers can download the Bonjour SDK to add Bonjour technology to their applications. For more information about developing products that use Bonjour, and to download the SDK, please visit <http://developer.apple.com/bonjour/>.
Providing Feedback
If you have specific product feedback, visit <http://www.apple.com/feedback/bonjour.html>.
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Updated August 14, 2015