I signed up for an account with Zoho Writer. I created a document, but wasn't sure how to share with anyone. A co-worker created a document and asked for my input. I received an e-mail telling me that the document was there. I made the changes/suggestions and saved them, but I'm not sure that she ever received the e-mail telling her that I had made changes.
Once I understand how this works, I think it would be very useful, particularly when away from the office.