The Virtual Machine Communication Interface (VMCI) supports fast and efficient communication between guest virtual machines and their host server.
VMCI Sockets 5.1
Released 10 SEP 2012, with vSphere 5.1.
The VMCI Sockets library provides a communications API similar to Berkeley UNIX sockets and Windows sockets. You can program VMCI Sockets using C or C++. The VMCI Sockets header file is installed with VMware Tools on guest virtual machines.