AppleScript: The Definitive Guide

Name

choose application — application selection dialog

Description

Puts up a standard Choose Application dialog. The user can choose from a list of all applications, or can switch to browsing in a standard Open File dialog. Returns an application specifier, or an alias if requested; or a list of either, if multiple selections are allowed. If the user cancels, an error is thrown (-128: “User canceled.”)

Example

set theApp to choose application as alias
tell application "Finder"
        set isScriptable to has scripting terminology of theApp
end tell
if isScriptable then display dialog "It's scriptable!"