How to Obtain taskId of a particular process instance

Hi All
I have a requirement to receive input & feed the received input for approval (through human task). I would like to bypass the login aspect for the human task & directly display the particular instances task details. I don't want to display all the pending tasks (in a worklist fashion).
My flow will be as follows:
Person A initiates the process & feeds input.
The next task is a human task.
Person A/Person B should see the input fed by person A in the human task for this current instance.
Is there a way to pass instance id or task id across the entire workflow? Based on task id, I can display the payload form directly for human task.
Thanks
Badri

http://download.oracle.com/docs/cd/E12483_01/integrate.1013/b28985/oracle/bpel/services/workflow/query/ITaskQueryService.html

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