CKEDITOR.instances code example
Example: ckeditor get instance from textarea
//jQuery adapter
$(element).ckeditorGet().setData('test');
//Without jquery adapter
CKEDITOR.instances.ckeditorid.setData('test');
//jQuery adapter
$(element).ckeditorGet().setData('test');
//Without jquery adapter
CKEDITOR.instances.ckeditorid.setData('test');