IndigoVision has released a network based virtual matrix solution named the&nbsp;IP Video Wall [link no longer available]. In this implementation, IndigoVision's client software is loaded on various PCs with 'master' and 'slave' versions. Operators running the 'master' version can send video up to 98 slaves with each slave connecting to 4 monitors. These connections are done over an IP network allowing the video monitoring to be distributed in multiple locations. A license fee for this software is charged on a per slave basis by dongle.
Below is IndigoVision's introductory video:

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Many VMS manufacturers support video walls as they are becoming a key component for large scale security operations to monitor hundreds or thousands of cameras. Compare to Milestone's&nbsp;<a href="https://ipvm.com/reports/smart-wall-addon-examined" target="_blank">video wall offering</a>&nbsp;announced in September 2009.

IP Video Wall Examined