Save comments for every user activity on K2

Hi,

How to save comments on K2 for every client event? We need to display list of all activities and then on click of particular activity should fetch comments. We want to capture this on K2 side only and not on database. Please suggest how to implement this. We watn to display for active and completed processes.

I guess we cant use acitvity data fields. If we use process data fields how do we map the comments for particular activity?

Thanks,

Shilpa