If you Press Command + Tab and hold, you can see the Sequence of Frontmost Processes
at AppleScript you can Access the First Frontmost Process
Code Example:
Tell application "System Events" to get first process whose frontmost is true
but you can't access all sequence of frontmost ( or I don't know how )
And here is the question: How I Can Access the sequence that is showed when Command + Tab is pressed ?
Obs: Command + Tab is called Application Switcher