Identify a specific Safari window

Question

I am trying to write a script to screencapture or print a specific Safari window.
I have 6 monitors, 1 monitor is always devoted to one Safari window that displays the same website. Other Safari windows are open as well, in addition to other applications. How do I identify the Safari window that I want to script knowing that it is in the same position with the same URL?
Thanks in advance.

Answer 1

Hi Redshark,
Use the filter reference form:
tell application "Safari"
-- get reference to document by url
set d to first document whose URL is "someurl"
-- do something with d
try
set t to text of d
on error
display dialog "No document with that url."
end try
end tell
gl,