The same pop-up window can potentially be opened from multiple places. Is there any way to check if it is already open?
The three files are fileA.asp, fileB.asp, and popup.asp.
fileA.asp causes popup.asp to open.
While popup.asp is still open, fileB.asp causes popup.asp to also open.
Before popup.asp opens for a second time, resulting in two popup.asp windows open, is there a way to check if it already exists?