The History tab contains a list of all Note/History records associated with the current requirement:

The grid shows each note/history record in the colour associated with the task type as well as the icon of the task type.
The following buttons are available to the right of the grid:
Add a new
note/history record linked to the client contact linked by the
current requirement record.
Update the
selected note/history record. This opens the Task form. Double clicking a row
will also drill down and open the Task form.
Delete the
selected note/history record. The user will have to confirm this operation. The
note/history is removed from the grid after the operation completes.