Using Google Docs to Compose
Google Docs in Action
Watch this video to see how one teacher does it!
A true to life example...
This is a book share project my son and I worked on simultaneously. As he wrote, I asked him questions to clarify/revise/edit as he typed (I typed the questions under the paragraphs as he built the paragraphs). He was able to immediately make changes and we were able to verbally discuss why he made the changes or questions he had about what I had suggested or asked.