A "status" similar to Do Not Disturb, but IM's do come in and out - and a personalized "message" sent to users who IM you basically like like
"I'm sorry, I'm not available right now, but I will get back to you as soon as I return. please leave me a note of what I can help you with"
This is really essential to when I'm working in both PhotoShop and SL because it shows me online - but a DND would be perceived as "rude"
Microsoft Windows 10