The status bar shows whether the current model has been saved, loaded, merged, changed etc.

Other items appearing on the status bar are:
current entry number, level in the model (+ number of descendants, if any)
entry colour status:
   E=Entry has its own colour
   M=Model colour is set and the entry is transparent
   P=Model colour is not set, the entry is transparent and
   is therefore showing according to BrainStorm preference settings.
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