At one time there were nine different systems in use.
Is a problem due to the systems in use or individuals who are behaving unprofessionally?
Most other more advanced systems in use today require adding a special networking device to the user's computer.
Wal-Mart has long been acclaimed for the advanced inventory systems in use in its 2,800 retail stores.
The contactless card systems in use around the world employ several different and incompatible wireless technologies and software standards.
The advantage of this system is "that it's not based on using a computer like a lot of the encryptions systems in use now," he said.
The best current counter-measure is wheel slip/slide protection or WSP, but systems in use do not give enough immediate information to drivers to be wholly reliable.
And there are a wide variety of lot management systems in use, making it difficult to track the number of empty spaces precisely.
The two-year delay in Britain's participation has been accompanied by concerns from the campaign group GeneWatch and others that the different DNA profiling systems in use within the EU risk throwing up large numbers of false DNA matches.
The debate, which involves low-power radio emissions that the Defense Department says may jam as many as 10 types of radar systems in use by United States military forces, presents a thorny policy issue for the Bush administration.
Perhaps the most common interactive systems in use today are electronic program guides, which let viewers see when programs are playing and order movies on satellite and a growing number of cable systems.
