Textmate & Notepad++ can complete all words which appeared in the current document, how to enable this in Coda?
e.d. I have typed "some_text" in a document, then when I type "some_" then press ESC - "some_text" should appear in the suggestions list.
Auto-complete in Coda is automatically enabled, and as far as I know, it can't be disabled. It is a lot like Dreamweaver with auto-complete, it will show you your starting tags and should automatically close some tags.
As for words, I'm pretty sure that it doesn't do that.