You can remove tasks from another workstation using a manual action.
        What you should know
You cannot remove individual tasks from a remote workstation. The Clear
                tasks command removes all open tasks.You can only close tasks for users who
                are currently online.
        To close a task using a system action:
- 
                In the notification tray, click Hot actions (
).
             
- 
                In the Hot actions dialog box, click Manual
                        action.
            
 
- 
                From the list of actions, click Clear
                    tasks.
            
 
- 
                From the drop-down list, select the saved public task that you want to
                    remove.
            
 
- 
                Select whether to remove the task from a user (User) or
                    a workstation (Monitor).
            
 
- 
                From the Select destination list, select the user or the
                    monitor from which you want the tasks to be removed.
            
 
- 
                Click OK.
            
 
        All open tasks are immediately removed from the remote monitor. A confirmation
            message is produced on the sender’s workstation.