That is not how it works, you can connect the scanner and driver around and read all data.
Example: for my car i use a bluetooth reader on the plug and read the data using Torque when looking for general data. When in need for some specific Mitsibushi data I switch to a cable and my laptop and evoscan to get as much data as possible. The switch to the cable is because it is much faster and therefor i can get more readings from more sensors then using the Bluetooth reader.