Sinclair QL User Manual page 20

To set the station number type the command NET followed by the station number of your
choice. For example, to set the QL to station 5 type the command:
Place the program cartridge in Microdrive 1 and load the program by typing:
Once the program is running, you can receive data sent along the network by typing the
load command in the normal way. If the data was being sent by station 12, you would
enter:
This must be done before station 12 starts sending.
To send data, type in the save command. Assuming you were sending to station 23, you
would enter:
Station 23 must be ready to receive before you press ENTER.
NET 5 ENTER
LRUN mdv1_boot ENTER
LOAD _neti_12
SAVE _neto_23