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Previous: Interactivity  Usage modes  Generally speaking there
are two main forms of usage for a shared editor:  In practice,
when working in groups, we observe that shared editors also get
used to a degree as additional communication channel, but this
can largely be though of as annotation, even though these meta-
annotations are not directly associated with existing text. Thus
it is important for a shared editor to be able to easily support
both these communication modes as transparently as possible.  If
we satisfy the interactivity requirement above, it is vitally
important, whether annotating or modifying text, that the person
making a particular change is easily identifiable, even though
several changes may be being made simultaneously.