Let me complete my reply with more details...To visualize the (X, Y, Z) position of each person in front of the sensor, you can use the SPD EVK GUI and use the Users Analysis widget as shown below...If you prefer using your favorite Serial Com emulat...

I confirm that SPD is able to detect and monitor the X/Y/Z position of up to 4 different persons, provided those persons are far enough from each others to be identified/separated within the 8x8 depth map...