Hope this doesn't show up twice, but it did not show up after I thought I had posted it.
An option would be to have the MA lock windows and have the chart open under their name. The Doc comes in and forwards the chart to themselves, logs out (control L) then logs in under themselves.
Yet another option would be to assign rooms. Dr. A only goes to Room 2. The patients in Room 2 will be sent to Dr. A. If another Doc goes to Room 2 he knows he has to pull the chart from Dr. A's box. (They would have to log in under the other Doc and pull the chart or log in under the MA and pull the chart back and reforward it to themselves.
Again, neither is an ideal solution