Specifies that the editor must convert all special characters available in the text to their relative HTML entities, as defined by the W3C standards. It is set to true by default.
For example:
FCKConfig.ProcessHTMLEntities = true ;
You can use the IncludeLatinEntities and IncludeGreekEntities settings to exclude some characters for the conversion.
The complete list of entities can be found here: http://www.htmlhelp.com/reference/html40/entities/