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[Hans]

correction to the last:
the conditional was a bit wrong.
Try this:

(:cell:)
(:A1: :){$:A1}\
(:if expr ( ( equal {$:A1} '' ) && authid ):)\
[-(:ptvreplace name=A1 label='add me' val={$AuthId}:)-]\
(:if expr authuser {$:A1} && authid:)\
%right%'^[- (:ptvreplace name=A1 label='X' val='':)-]^'\
(:if:)


  ~Hans