Others too. Especially at home (home is home iykwim), but they have similar problems at school. They find it frustrating too. Interactive whiteboard has helped, he will do stuff on there that he wouldn't do elsewhere. And sometimes putting him with the older or more academically able children seems to help.
Halo is a teach ask style of teaching, where you start by using fixed choices in a teach ask format. So at the beginning you would start with something very easy like the days of the week, teach them then ask 'what day comes after Tuesday is it Wednesday (spell it out and write on a piece of paper) or apple (spell out and write on another sheet of paper). Hand the pen to the child who then circles the correct answer. It's been used to get children who have been previously thought of as being severely learning disabled doing age appropriate work. Slowly you move onto writing and typing as well. Obviously as the child becomes more confident and gets the idea you would move onto closer choice, Wednesday or thursday rather than Wednesday or apple for example.
It's independent from the beginning, - you might hold up pieces of paper or a letterboard at the beginning but you don't physically support arms etc - or if you do you don't for very long. And you would work towards the child working with the paper or letterboard flat on the table and with no physical support. It's been developed for use with severely autistic non-verbal kids. Informative pointing is more or less the same, but political differences mean they've sort of gone their separate ways. There may be more emphasis on typing with IP, although I'm not sure, that just may reflect the different ways they've been written about.
DS1 is able to use the technique to talk about choices, (what he wants to do, where he wants to go, what he wants to eat), interests (why he likes something, what he likes- and he understands 'something else' as well as a choice which is useful when you are guessing) and feelings (he hit his head because he was cross not because he was sad). He's lying down because he's poorly not because he's tired (that was the first time I used it, - he was very clear in his choice, and threw up 30 minutes later- the only time I've ever been pleased to have a child of mine throw up!) In fact he likes doing it for these sorts of things. When he's next going to respite, what he wants to take with him, what he wants to watch on YouTube, which beach he wants to go to etc etc. He does best with a plain A4 pad and choices written either side. He then circles pretty well. He does even better with tapping (so I say the choices and tap different spots on the table or nearby wall or floor, he taps the spot that corresponds to his choice) although I am trying to do more circling that tapping slowly (think it's easier and more accurate for teaching).
But as soon as I try and teach with it - whoosh - he's off! Or freezes. I think he is terrified actually, he gets very anxious. It's something that has developed gradually over the last few years (aversion to teaching). I've only been trying a couple of days though. And we have had some answers (correct ones too).