A surgical robotic system comprising: a surgical robot; a user interface console coupled to the surgical robot whereby a user can control motion of the surgical robot; a data logger for logging data from a surgical procedure performed by means of the robot; and a portable user terminal; the system further comprising: a display controllable by one of the data logger and the user terminal, that one of the data logger and the user terminal being configured for displaying a machine-readable code whereby the data logger or a user of the user terminal can be identified; and a camera coupled to the other of the data logger and the user terminal; the said other of the data logger and the user terminal being configured to, on receiving from the camera an image of a machine-readable code, decode that code to identify the data logger or a user of the user terminal and to cause the identified entity to be logged in association with a procedure performed by means of the robot.