VitalWeb Ajax -
Runs over the internet, in any popular browser.
Much easier - Has very compact interface, shows all variables in small space.
Lets user concentrate on one task at a time.
Therefore, much easier to use than alternatives.
Much more powerful - The functionality of a desktop program in a browser window.
Lets user make ICD sets, area sets, race sets, any age groups, etc.
Therefore, more flexible and powerful than alternatives.