There are also different kinds of annotations. A question, for instance, will be indicated by an icon with a question mark. These annotations are HTML documents as themselves, and can therefore be annotated as well. Although asynchronous computer conferencing has many advantages, it is not suitable for all kinds of collaborative work. When the objective is to find a solution to a problem as soon as possible, synchronous communications may be appropriate.
Problem solving discussions have to be vivid in a certain way, and feedback is very important.
This can be a handicap when these media are used for discussing a topic.