I know you asked me this question before and I couldn't answer it but after watching Hobbyknitter's video I can see how it's done.
You need to pull the needles that will be slipped into holding position and knit the row, as you would if you were doing a manual tuck stitch.
For the next row, pull out the needles to be slipped into holding position again. Any that are no longer to be slipped will now have a float in the needle hook. You need to put this float under the needle otherwise it will just produce a tuck stitch when you knit the next row. To make sure that the float stays under the needle and doesn't get caught on it when you knit the next row, you need to put that needle into forward working position with the stitch behind the latch.
Hope this helps.