The decimal separator is usually set by the locale setting of the OS.  For example, if the locale is US, the decimal separator is  "." and if the locale is French, the decimal separator is ",". This corresponds to the convention that the decimal representation of 1/2 is 0.5 in US and 0,5 in France.

However it is possible to override the default decimal separator either in the OS or in the application ( e.g. Excel ) and set the desired character as separator.

Overriding such settings will cause problems in a few situations like exporting an approximation to Excel from Isight. This is because Isight relies on system locale settings to get the decimal separator and if it is somehow changed, it won’t receive the new decimal separator.

In such situations, one can easily set the decimal separator  in Isight Design Gateway by going to

"Edit -> Preferences -> Parameters -> Display "

and choosing the desired decimal separator.

This post is also available as QA00000023884