Alerted by the two incidents, the company traced the problem to a software flaw and recalled the vehicles.

A version, based on Windows 98 that is scheduled to ship this fall, will fix software flaws and add some new consumer-oriented features.

The company called the software flaw a "critical" vulnerability, its highest rating.

Jared in Australia doesn't understand why software flaws are so hard to find.

Common types of software flaws that lead to vulnerabilities include:

At launch, the card's performance was below expectations and it had numerous software flaws that caused problems with games.

A software flaw on one of the first days of operation paralysed the trains for several hours.

The term "exploit" generally refers to small programs designed to take advantage of a software flaw that has been discovered, either remote or local.

This software flaw eventually led to the North American Blackout of 2003.

"It was simply a demonstration of a software flaw."