Canon EOS 1D X Mark II - Manual (Page 96)

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Using the Transmitter with WFT Server
 For how to use WFT Server, see page 59.
 To switch cameras, enter the IP address of the master or slave
camera in the web browser.
 When shooting remotely with linked shooting, connect to the master
camera. If you connect to a slave camera, only that slave camera
will shoot, without linked shooting.
 You can connect to slave cameras, adjust the focus and configure
shooting functions, and then use the master camera for linked
shooting.
Making Images Viewable and Shooting Remotely