21.   Sun Microsystems Inc. makes the computer work stations used as the hubs, or servers, on computer networks attached to the Internet.

22.   Television stations use the public airwaves for free, in exchange for some measure of public service.

23.   The FCC is assigning channels that stations can use to carry digital programs while they continue broadcasting on their existing channels.

24.   The ground stations will use tracking programs to compare the exact distance to a GPS satellite with the range implied by its radio signal.

25.   The new Lukoil station will use gasoline from local suppliers.

26.   The new Lukoil station will use gasoline from local suppliers, though at a later date it may enter contracts to swap Russian crude for U.S. gasoline.

27.   The stations use software like RealAudio or Windows Media Player to send video or audio over the Internet.

28.   The stations will use their second channels for the new digital programming while continuing to broadcast conventional programming on their original channels.

29.   The sweeps are a period in which local stations use audience measurement to set ad rates.

30.   This wireless temperature station uses remote sensors to transmit the temperature to the indoor display unit from as many as five different locations.