RepRapPro was using for all its machines a board equipped with a 32 bit arm processor, the Duet V0.6 then V0.8.5 (same processor as an Arduino Due). A delta printer requires much more calculation power than a cartesian and 8 bit boards are struggling to operate deltas. Typically, you cannot use a LCD screen on a delta with a 8bit processor controller, as it requires too much computing power.
Provided your network runs DHCP, the connection to the printer is automatic, simply calling its name (modifiable) in your web browser. Alternatively, you can configure a fixed IP adress. Note that on mobile device, you shall use IP address.
A major feature of the Duet is the fast transfer speed over WiFi or Ethernet at 500 to 1000 kB/sec, which is a very rare feature even on other 32 bit boards which rarely exceed 40 kB/sec. This allow the quick transfer of the G-Code file to the board SD card and improve usability as print is always done from SD card. This remove all the troubles caused by USB connexion. This does not prevent to send G-Code from web server for any adjustment, initialisation or other operation.
It shall be noted that the majority of Duet operates 'Headless' with no local screen or button, but with WiFi, phones or tablet could be used to control the printer if it is remote from the main computer.
Having such a capable brain in a low cost machine as the Fisher was unique on the 3D printer market.
The Duet had initially scarce documentation but this have evolved with Duet WiFi where you can find relatively exhaustive documentation (sometimes also for older boards) on Duet3D site.
An important information is also the calibration of the Analogic converter on Duet 0.6 and Duet 0.8.5, required to improve the accuracy of the temperature measurement. All my calibration shown that the theoretical temperatures were off by more than 10°C (this adds to thermistor inaccuracy). See https://www.duet3d.com/wiki/Connecting_thermistors_or_PT1000_temperature_sensors. This BOARD calibration is automatic on Duet WiFi and Duet Ethernet.
I developed a page on the configuration of the Web interface (obsolete)
Note that the Duet WiFi sold on AliExpress are NOT genuine, even if they show the 'genuine garantee'