The ones that come up when you press alt or space etc? I get distracted easily, and would like to turn off clutter. Can't find any sort of an option for it.

Edit > Prefs > Notifications. You can also reroute the messages to the Status Bar, which is where they appeared in H13 (which not many users tended to notice).

Perfect, thanks!

Well, after using Houdini for almost 5 years, I finally stumbled across this little tip...

I think I've been living with this for 10 years or so. My god...so clean.