CAVE_USER_ST
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a structure containing data for a networked user. The structure entries are:
·CAVENETID id - the user's ID  
·float timestamp - the last time data was received from this user (in local CAVE time)  
·int num_sensors - the number of tracker sensors  
·CAVE_SENSOR_ST sensor[] - the user's tracking data; sensor[0] contains the head data; the remaining entries contain the data for the wand and other tracked devices  
·CAVE_CONTROLLER_ST controller - the user's controller data (buttons & valuators)  
·void *app_data - a pointer which can be used to store application data associated with the user. The library does not touch this entry except to zero it when a new user is initialized.