Inside Macintosh: AppleScript Finder Guide /

Chapter 2 - Finder Objects / The Finder Application Object

References to Finder Windows

References Returned for a Point

To get a reference to the content space that lies under a particular point on the desktop, run a script like this:

tell application "Finder"   content space {100, 100}
end tell
--result: window of folder "Projects" of startup disk of 
application "Finder"

The pair of integers in braces identifies the point in which you're interested relative to the entire screen (including the menu bar), and the result contains
a reference either to a window or to the desktop. It is usually easiest to use the term Content Space to obtain this kind of reference, because the script returns
a reference even if the point is located in the desktop window.

You can also specify more restricted window classes, such as Window, Container Window, Information Window, and so on, as shown in the
next example.

tell application "Finder"   container window {100, 100}
end tell

The script in this example returns a reference only if a container window contains the specified point. If the specified point is located in some other
kind of content space, such as the desktop or an information window, the
script returns an error.

You can use similar methods to find out whether an item or other object lies under a particular point. For example, this script returns a reference to an item if the item's bounds enclose the specified point:

tell application "Finder"   item {100, 100}
end tell