Using the console in the Admin room will give you overview of all the players locations. Keep in mind that it only shows players icons that are located in rooms and not hallways.

Dead bodies will still appear as a player icon in the Admin console. If you see multiple players in a room and then all but one leaves, it's a good idea to go check that room for a dead body.

As mentioned previously, the Doorlog is a unique feature only available in Mira HQ. The doorlogs can be found in the communications room of the map.

This mechanic allows the tracking of the players based on 3 sensors located in the three-way junction just north of the Cafeteria, everytime a player walks through a sensor, they will be registered in the doorlog.