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The Virtual Machine Communication Interface is mentioned in many of the VMware courses and many students seem interested in its capabilities. 

It was intreduced to facilitate high-speed communication between virtual machines and their host, or between guest virtual machines on a host. VMCI does not rely on in-guest networking. The VMCI Sockets library offers a convenient interface for programming the VMCI device at the user level.

With Workstation 8.0 and vSphere 5.0, guest to guest communications (VM to VM) are deprecated. This inter-guest functionality may be removed in the next vSphere release. Support will continue for host to guest communications.

For further info check out http://www.vmware.com/support/developer/vmci-sdk/VMCI-1.0-Relnotes.html

Categories: vSphere
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