A global comment always refers to a bigger part of the turn or to the whole turn. Thus, it is more concise to put one comment at the end of the turn than labelling each word separately. A global comment may involve a technical occurence, irregularities in the subject's speech, or everything else that's extraordinary compared to the previous or following turns. The global comment is placed directly after a turn and starts with a semicolon.
w001_ptd_001_AAA: hallo , Herr ~Meier , wir m"ussen einen Termin
;Sprecher ist heiser.