As far as I've seen there are no "EM_*" messages at all. The paradigm has been abstracted entirely to an object oriented model but all the old-school message-based functionality is still there encapsulated in ready-to-use interfaces such as "ITextSelection" or "ITextParagraphFormat" (and many others I'm sure) so it would take a while to absorb this new information but it should be well worth it in the end especially since all these interfaces could be easily written in tB.