Running 2 scripts using the browser simultaneously

Question

I was wondering,
Is there a way to run two different AppleScripts using Safari at the same time, so that e.g. one would operate in one tab and the other in a different tab? How do I go about that? How do I avoid conflicts? (I should add that my knowledge of applescripting is rather limmited, so more information is better than less )
Also, both scripts would be using the curl command and shell script to download or save files, etc. What would happen, if both scripts tired to call the curl command at the same time? Would that cause a conflict, or would the scripts just be put in a queue?
Any ideas?

Answer 1

but how do I know which document is which? Is there any way  to tell safari to set the index of a document?
There are numerous ways of identifying/tracking objects within AppleScript - and that's generally true for any object in any app.
In this case 'index' is really front-to-back order, so 'document 1' (or 'window 1') is the frontmost, and therefore the inverse of how you created the documents in the first place. Of course that gets messy as you open new windows, move them around, etc.
You can change the index of the windows, though, which changes their relative order:
tell application "Safari"
          set index of window 2 to 1
end tell
There are other ways, though. For example, each window has an associated ID, which is persistent, therefore you could store the ID of each newly-created window and use that as your target:
tell application "Safari"
          make new document with properties {URL:"http://www.apple.com/"}
          set appleID to id of window 1 -- store the window ID
  -- later on you can reference that same ID:
  delay 5
          set s to source of document of window id appleID
end tell
Other options include the name of the document, as well as relative options. Each application and object class has its own terms, so you'll need to explore the dictionary to determine what's appropriate for any given task.