What is the best practice to display info of completed task in process flow

Hi all,
I'm starting to study BPM modeling with CE7.1 EHP1. Thanks to the tutorial and example on SDN site and I can easily build my own process in NWDS and deploy to server, start it, finish it.
I like the new runtime which can show a BPMN diagram to the processors. However, I can't find a way to let the follow up processor to review the task result completed in previous step. I'm more familiar with Guided Procedure, and know there is "Display Callable Object" which can used to show some info of a completed task when the processor/owner/admin/overseer click on a completed task. Where is the feature in BPM ? What is the best practice to show such task information in BPM environment.
For example, A multiple level approval process, the higher level approver need to know the comment written by the previous approver. Can he read this information from process flow ?
I think it is very important feature for a BPM platform. In Guided Procedure, such requirement can be done with Display Callable Object + View Permission, and you just need some coding for the UI. If BPM is superior to GP, I think there must be a way to achieve this, I just do not know how ?
Can anyone shed me some light on it ?

Oliver,
Thanks for your quick reply.
Yes, Notes and Attachment CAN BE USED for the purpose. But I'm still looking for a more elegant solution.
With the solution of using Notes/Attachment, the processor need to give input at two places : the task UI and Note/Attach , with similar or same data. It is really annoying.
Is there any SAP BPM real-world deployment ? None of customer has the requirement ?

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