New Delhi, Oct 12 : The Union Government has asked mobile operators to strictly ensure that calls are not processed on such handsets that cannot be tracked by sleuths after concerns were expressed over security lapses in the use of cell phones without proper security codes.

The security code known as International Mobile Equipment Identity (IMEI) is a 15-digit number unique to a mobile handset and this can help in tracking or blocking of the mobile phone.

Washington, October 12 : San Francisco-based firm Posit Science has developed a set of five video games, together called InSight, to improve the mental acuity of older drivers.

Insurance provider Allstate sent the games to 100,000 drivers aged 50 to 75 in Pennsylvania last week, hoping that the pilot program will turn older drivers into safer drivers.

"We expect to see that the group using the software will have a lower frequency of crashes verses the group that didn''t use the software," Discovery News quoted Tom Warden of Allstate as saying.

Hanover - When looking to buy a Mac, review the performance data for the individual models carefully. The differences between models are big, according to a recent study by the Hanover-based c't magazine. That applies to the optional features, the processing power, and the expandability options for the individual systems.

For general office applications, the Mac mini (around 500 dollars) is generally enough. Another introductory model in the Apple program is the MacBook, which is more expensive than other comparable laptops with identical performance. Users who want a MacBook anyway should wait for the next generation, the experts recommend. It may be released before the year is out.

Hamburg - If speed matters when transferring data, then consumers can hardly go wrong when buying an external hard drive. The Hamburg-based Computer Bild magazine recently tested eight devices in the 2.5 and 3.5 inch format, and the results were encouraging.

The devices all received a grade of "good" for their speed. The noise levels on the hard drives were also checked, with most models barely audible, the magazine reports. The test did reveal that many models run very warm, which can have a negative effect on service life, the experts feel.

Berlin - DVB-T - digital television received using an antenna - is available in a growing number of cities and countries. It's even possible to watch DVB-T on a laptop. The easiest way to do so is using a USB stick as a receiver.

"There are also cards for the PCMCIA slot on older laptops," says Michael Wolf, hardware expert from the German consumer testing organisation Stiftung Warentest in Berlin.

Paderborn, Germany - A ride on the oldest stretches of New York's subway is no further away than a quick trip to the video game store, thanks to World of Subways - a new simulator program.