Wonderware Intouch's cross reference tool allows you to search for WW tags, but not PLC tags. PLC tags are referred to as "Items" in the DDE/OPC topic you've configured for the PLC. To search for a PLC address in a wonderware application: 1. Open WW Intouch Application manager 2. Click the "DB Dump" icon. This will create a file called DB.CSV containing all the tag information. It's a good idea to rename the file with the date or some revision number. 3. Open the file with notepad or Excel and search for your PLC address. If used, it will show up in the "Item" column for the row of the Intouch tag to which it is associated. Scroll to the left of the row to get the tag name. 4. Use the Cross Referrence tool in Intouch to find the windows & Scripts that use the tag associated with your PLC address.