Kevin -
In TestStand 2.0 the only way to search a sequence file is to search the file using a text editor and then try to figure out what the text in the file is referencing.
In TestStand 3.x, we have added find/replace feature in the sequence editor. This feature searches a single file or multiple files easily and you can limit the search in many ways, so it would be able to tell you. It also has a goto location feature which brings you to the dialog where the item is being referenced.
Scott Richardson (NI)
Scott Richardson