This is really weird.
On my desktop computer, I often use Alt-Escape to send the active window to the background. This is really useful for window management.
However, when I try pressing Alt-Escape on my new laptop, it does something similar but not identical: It sends the active window back, but not all the way to the background. i.e., instead of giving it the lowest index number, it just decrements its index number, probably by 1.
Both computers have the same Windows XP Professional.
Why is this? And how can I make my laptop computer send the active window to the background instead?