Data in input fields is stored per user in the .shared file on the Qlikview Server. You cannot retrieve that for other users than yourself. If you need to exchange comments with other users then you need something like IInsight for Qlikview
What you want is not possible with input fields. As I said the values are stored per user and cannot be shared. Qlikview is not a data entry application. You'll have to do the data entry part in another application. Perhaps you can use an excel file that the users fill with their comments data.