1. If you want to get the select html content of the user, please refer to http://www.cutesoft.net/developer+guide/scr/Get-HTML-from-Selection.htm, it shows you how to get the selected html content.
2. If you want to post the content when in the edit view of Editor, for now can not achieve it.
3. If you want to get the post content, it depends what script you are using in the page, asp.net/php/classic asp using the different method.
What i mean the page is not the page which contains the editor. It is the end page which you save the editor content as.