Many applications use some sort of threshold value to define various actions. Such thresholds will have to be identified and changed. Other common thresholds used in applications include authorization levels, data validity checking, and exception report generation. It may not be possible to change all applications over to the euro at the same time. This means that applications will have to communicate with applications that are not euro-compliant.
Many enterprises have links to systems belonging to other enterprises.
In this case, the changeover to the euro requires careful coordination between the various enterprises. At some time, enterprises will have to convert over to the euro currency completely. When this occurs, a considerable amount of historical data will probably also have to be converted from the national currency to the euro. The European Commission is determined that the euro currency symbol will have a prominent i.e. visible and easy to use, placement on user's keyboards, and has issued two proposals. Many existing European keyboards use this type of engraving.