All-In-Wonder overlay-only output?

[Nerdology]

A quote from someone on another message board (thread title: "Which TV card should I buy?") :

I would recomend any of the radeon All-in-wonders by ATI simply because they have a TV out that with the new Catalyst drivers, allows you to play a movie full screen on a TV and have it windowed on the PC.

The person who wrote this also said he has an All-In-Wonder Radeon 8500DV. I had never heard of this feature; my former video card was an AIW 128 Pro 16MB, and now I have the AIW Radeon 7500. I asked for a little more information, and he said he believed it was called " 'cinema mode' or something like that" and its function was reproducing the overlay on a television.

Well, I've been Googling for around an hour or so and haven't found relevant information and was wondering whether any of you have heard of this/have any experience with it.

My configuration:
Athlon T-bird 1.2@1.33 on EPoX 8KHA+, 512MB DDR, Windows XP Professional.
Latest Radeon drivers, capture drivers, ATI control panel, and multimedia center, as of 8/4/02
All-In-Wonder Radeon 7500 AGP = primary display
Radeon 7000 PCI = secondary
Viper V550 PCI = secondary (yes, it's a three-monitor system)

I can treat the connected television as a fourth monitor for more desktop, or I can have it mirror the primary display, or I can disable it.

 

[Nerdology]

Okay, update: after much experimentation, I discovered an option called "Theater mode" in the Overlay controls, and found that when checked, the overlay is indeed sent fullscreen to the TV.

The catch? When additional monitors are enabled (id est, those on the Radeon 7000 and the Viper v550), the "theater mode" option vanishes from the controls. No wonder I'd been unable to find it; I've been using multiple display for two years.