31.   Location-based tracking systems in wireless telephones let them know where employees are.

32.   Now the INS, using lessons from the Atlanta project, is developing a new Internet-based tracking system called the Student and Exchange Visitor Program.

33.   Onboard tracking systems would take over during the final seconds as the interceptor homed in on the enemy warhead.

34.   Opposition to the tracking system faded after the discovery that one of the suspected hijackers had come on a student visa, however.

35.   Others use active tracking systems with movable mirrors that are nudged regularly to keep the beam centered.

36.   Precise figures on the frequency of HIV drug resistance are lacking because there is no national tracking system.

37.   Prosecutors have instituted a new tracking system for the fraud division to keep supervisors informed of all fraud cases, he said.

38.   Private carriers like United Parcel Service and FedEx say they hope their tracking systems will give customers confidence to continue shipping.

39.   Questions have been raised over whether the INS has enough agents to investigate violations a tracking system might reveal.

40.   Sailors and hikers already are using the tracking system, which was developed for the military.