An example of such a pointer is that the display object that represents a hit LAC tower contains a pointer to the relevant LAC data bank.
At the Assign Parent stage of the SLD Event Display System
One uses a set of Event Display commands to create what we term relations graphs that define how pick ids should be grouped. For example, one can build a relations graph that has pickids assigned such that each calorimeter cluster is drawn with the same pick id as its associated drift chamber track.
This wonderful, powerful tool is rarely used.
The reasons is that this system initially worked only on high-end workstations.
It violated two rules:
