These are elementary streams and they would be used by DVD authoring apps that use them for reasons like foreign language capability. Examples would be DVD Studio Pro, Adobe Encore, Toast.
The most straightforward way to burn your DVD is either to use the Share feature in FCP or the Batch Template feature in Compressor.
If you can find a boxed copy of iLife (try Amazon), it should have iDVD as part of the suite of apps. iDVD offers far more complete authoring capability than FCP or C4. iDVD doesn't work with elementary streams; you'd just drag in your HD movie and you'd be good to go.
In Compressor 4, you can also make a job action for burning a DVD instead using the batch template. Click on the job (not one of the settings), and in the inspector menu, go to the Job Action tab. You'll see an option for burn DVD. I recommend making a disc image on you hard drive first to check the quality without wasting a dvd. I personally can not get a decent looking DVD coming out of FCP X using share and Compressor will not finish an MPEG 2 encode (400 hours later).