How does wincc7.5 SP1 find variables and their positions through cross indexing?

WinCC7.5 SP1 How to find variables and their positions through cross indexing ？

The specific steps are as follows ：
Open cross index , Pictured 1 ,

If it is the first time to open the cross index , You will see the prompt that you need to initialize the cross index data . After a short initialization , The cross indexing program will be opened . Pictured 2 ,

In the name filter of the project object list box on the left, enter the name of the variable to be found , Pictured 3 ,

The position used by the variable will be listed in the list box of the position used on the right . At this time, there is no need to open the screen to find the object of use , Just jump to the object directly through the jump function , Operation as shown in figure 4 ,

At this time, the screen of using this variable “pic2.PDL” Will be opened , And the object that uses this variable “ Button 1” Will be selected , Open the button script to find the specific location of the variable . Pictured 5 ,