Retrieve CKEDITOR.editor instance by div's 'id' attribute

I'm a newbie with CkEditor 3.1, and trying to make it work in a Vaadin+GWT environment, which is more Java than javascript oriented.

I've created a new instance of an editor using JS

CKEDITOR.replace( id )

passing in 'xx' with this on my page

<div id="xx"></div>

. The editor appears just fine.

But now I'd like to retrieve that editor instance to do other operations on it, also using the id.

Do I use:

CKEDITOR.instances[ id ]

where id == 'xx'
Or:

CKEDITOR.instances.id

Or: something else?

Thanks,