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i will try to explain

first of all check your ip-range. by default the i-live uses 192.168.1.x
x=1 touchscreen
x=2 surface
x=3 mixrack
for example

your pc will be fine when you use

next step go to the preferences at your surface, network settings and enable external control.

plug in a cat 5 cable at your surface or mixrack in an ethernet plug.
other side into your pc,

start the editor choose online and the surface, wait a little moment and voila here you are