The Resources page, of the Task property sheet, lets you view the list of people that have been assigned the associated task. It lists their name and their progress in terms of a completion percentage.
You may use this page to both assign and un-assign the associated task.
To assign the task to one or more people, press the Assign… button and follow the instructions in the section "Assigning a Task" above.
To un-assign the task from one or more of the people listed in this page, select the relevant people from the list and press the Unassign button. OfficeTalk will remove the person(s) from the list and will send out e-mail messages informing the relevant people that they have been un-assigned the task.