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dfComma()
Set the comma delimiter
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Syntax:

     dfComma( [<cChar>] ) --> cOldComma

Parameters:

     <cChar>    Char to use like comma

Returns:

     <cOldComma> Old value

Description:

     With this function you can set the comma delimiter This set is used in
     dfCalc function to display in European or American notation the
     numbers

Example:

     dfComma( "." ) // Set the comma delimiter
                    // with ".". Default for USA users

See also:

     dfHot()