Page Type: REFERENCE
Multisync is software included in the Rangecast feed site package that coordinates the scanning pattern of multiple scanners sharing the same programming, so that each transmission is received by only one scanner in the cluster, while other scanners are free to detect simultaneous transmissions on other channels.
[FAQ-1129] What is a Cluster?A group of radio scanners operates as a "cluster" when all of the scanners are programmed to receive the same channels, and the scanners operate collaboratively via Multisync to efficiently receive transmissions on these channels. Each cluster is associated with a "cluster number", channels are assigned for reception to a particular cluster (by number), and scanners within a cluster (with the hub and number as part of its Rangecast ID) are programmed to match the programming assigned to the cluster.
For each cluster of scanners (whether operating on one or several PCs), Multisync is started automatically on one PC (designed the "master" for the cluster).
Multisync is separate software that runs alongside the feed site senders, and shows in the Windows Taskbar when hovering the mouse over the icon for the Multisync software. [img-icon_taskbar_multisync-final]
Technically, Multisync is a miniature special-purpose server that is responsive to network traffic directed to the PC at a specific port number. This server has very limited functionality, and was designed exclusively for communicating with the Rangecast sender software; unlike a standard server, Multisync only accesses information in its short-term memory space, and does not access file storage. Despite being a miniature server, Multisync does not require any special firewall permissions or port forwarding, because it is only used *inside the LAN* by other PCs on the same local network. There is no network traffic (inbound or outbound) with the internet.
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![[img-icon_taskbar_multisync-final]](images/img-icon_taskbar_multisync-final.jpg){kind=link}