Canon EOS 1D X Mark II - Manual (Page 90)

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Using WFT Server, you can shoot remotely with a master camera linked
to slave cameras set to shoot at the same time. WFT Server can also
be used to access the master camera or slave cameras for Live View
display, and you can adjust the focus and configure remote shooting
settings as needed.
 Additionally, images on camera cards can be viewed and
downloaded.
 Wireless LAN functions and operating system of the computer
must support ad hoc mode.
Using the Transmitter with WFT Server
Linked Shooting
WFT Server
Slave camera
Master camera
Slave camera
Slave camera Slave camera