Properties: Action inspector
This inspector determines what should happen when someone clicks the selected object with the Browse tool.
The default action is Does Nothing. You can click the object all you want, and nothing happens.
If you choose Opens a URL or Opens a file, you get a text field and two buttons. You can type a URL or file path into the field, or drag a file to the panel, or click the Choose File... button to browse your disks for a file. Note that file paths are relative: they start from the folder containing the document you're working on, not from the root of your hard drive. Click the Open button to try opening the file or URL in the field. When the object is clicked, the file or URL is opened.
If you choose Runs a script, you get a text field for entering an AppleScript. The script that you enter is run such that "self" refers to the clicked object. Click the Check Syntax button to make sure that the AppleScript is correct, then click Run Script to try it out. When the object is clicked, the script runs.
If you choose Jumps elsewhere, you get another pop-up menu for choosing where in the current document to jump. You can jump to a specific canvas, the next or previous canvas, or a specific point or object on any canvas. Some of these options offer a tiny canvas preview, in which you can click or drag to indicate which object to highlight, which point to center on, or where to zoom.