WinIPBroadcast is a small program that allows Windows applications to send global IP broadcast packets (destination address 255.255.255.255) to all interfaces instead of just the preferred one.
This application is most useful for users of server browsers or other network monitoring software. Specifically, those playing multiplayer games locally on multiple interfaces (for example, a LAN network and a Hamachi VPN) will be able to see games from all networks at once.
WinIPBroadcast is an open source (GPL), extremely small (450 lines, 15KB executable) C program. It works "behind the scenes" as a service without any user interaction. Its memory usage is 1MB. When you're not sending any broadcasts, its CPU usage is strictly zero.
WinIPBroadcast has not (yet) been tested on platforms other than Windows 7. Unconfirmed reports seem to indicate that WinIPBroadcast doesn't work on Windows XP, and that it doesn't work very well on Vista.