Hi,
Since iChat 5 there have been individual sub sections of the OS X communities for the related issues.
However I still read all new posts in this Community every day and as you say there are a mixture of iChat and Messages related threads.
If you mean SMS text Messages you cannot get them on your Mac version.
It seems it is one of those things that is always reported now and then to "be coming" but never seems to get here.
If you happen to live in the United States you CAN send SMS messages via Messages if you have an AIM account logged in AND the person is using one of these carriers.
You need to add their phone number with a leading +1 to the Buddy List. (As in +1234567890).
8:58 pm Tuesday; October 7, 2014
iMac 2.5Ghz i5 2011 (Mavericks 10.9)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.6.8),
Couple of iPhones and an iPad