How to tie TinyMCE into your own CMS?

Question

TinyMCE

I googled all over but couldn't find an answer. Help me understand how TinyMCE and other WYSIWYG editors work.
The fact is that I have my own PHP CMS that uses XML files instead of SQL. I installed and launched TinyMCE myself, it works, but in order to put the typed and edited text into XML, I need to assign it to a variable. And I have no idea how to do it.

Answer 1

TinyMCE hooks onto a regular textarea, and is passed to the POSTOM server as plain text.
On the server, the $_POST array should contain the html generated by TinyMCE