Payroll Federal eFile

Our payroll group is in the process of performing their Federal eFile process and had a few questions.  When they first select Tasks > Federal eFile in Payroll, the window opens providing a list of team members.  The list for one of our companies provides team members that have not been with our company for many years.  We’re trying to determine what field the tasks links to in order to exclude exited team members.  Do you know the answer?