Anyone in a group can access a chart, look at the face of a chart, and go to a finished note and read it...just as would be possible with a paper chart in a filing cabinet.
Anyone can make a new note and electronically sign it.
Only assigned providers can go to a note made by somebody else and electronically sign it (i.e., co-sign it).
Anybody can assign themself to a case.
The Principal Provider is just a clinical title, suggesting who you might want to talk to about the care of this patient when notes have been made in the chart by a number of different clinicians.
Only a Supervisor (assigned in the Documents and Settings section of the program) can enter the work area of another clinician, make changes, and re-compile the note. The name at the bottom of the note will always be the person compiling the note.