Fascinating question - so I set my D200 up with pop-up flash and took some pics using TTL and manual, and deliberately underexposing. In all instances the Exif data as read in Lightroom and Irfanview showed Flash Fired.
I then set up Commander mode TTL, did the same thing. The Exif data in LR and Irfanview showed flash fired.

Opened the images in PIE, (Picture information Extactor) and a slightly different picture emerges. The shots I took with Commander mode (and did not use an external flash) are recorded as "Fired, strobe return light not detected" and predictably the images were totally underexposed.

Have you accidentally set TTL in Commander Mode?

I've been buying and selling on eBay for fourteen years, and I finally ran into a minor problem - not a bad record. I have a car for sale, and the price went to $4,200. A couple of days later, the bid disappeared. The next highest bidder lost interest since he was outbid, so he bid on another car, and he has no intention of removing his bid on my car.

I was in a position where it would look as if the car had sold for the reserve, and I would be charged the fees. eBay has simple solution. There is a way for me to withdraw someone's bid, and that's what I did.

If you are ever in a position like this, go to the bottom of the page that lists the bids and click on "cancel bids." Then just follow along till you find a page where you enter the item number, the bidder's name, and the reason for the cancellation.