The "OS" on the commercial TVs is more or less for digital signage purposes only. Samsung is kind of the defacto in the market, but I've worked with some new Panasonics that are just as nice.

As far as the OS: It doesn't have an 'app store' and essentially you can program it to check in to an RSS feed / FTP / etc.. to grab new content, schedule content, or use a USB to load up a scheduler (Think like restaurant menu that changes from breakfast to lunch at 10:30am).

Other nice features may include ability to daisy chain to make a video wall, fallback/failover if HDMI1 goes off, RS-232 control or command of other systems. Some models also are built for 24/7 duty cycle, though, if you go to a local sports-bar or the like they will buy consumer TVs that will look blotchy within a year or two because they aren't built to be on 20 hours a day.

I missed that, updated with a different brand.