The Actor Framework is a part of LabVIEW since LV 2012. Extensive getting started documentation can be found by creating the Actor Framework template project (File >> Create Project... >> Actor Framework) and looking at the HTML files provided with the new project.
"Launch Root Actor.vi" and "Launch Nested Actor.vi" have an input to open the front panel. This input only works in the development environment In the run time engine, you will get error 1634. If you want to open your panels in the run time environment, you will need to either set your Actor Core.vi panels to be "run when called" in VI Properties or add an invoke node to call "FP.Open" somewhere. The input was added solely to support debugging.
Only the newest version of the AF is listed here. Older versions can be found in the complete list of Documents in this community site.
The framework is currently released for installation into LV 2011's user.lib and LV 2012's vi.lib. (The user.lib version can be used in LV 2012 but will lack integration with some native features of LV 2012.) There are three kinds of forks in each release path:
(and the Message Maker patch that goes with it... this makes the earlier install of the Message Maker work with AF 4.1.)
AF 4.1 for LV 2012 and later vi.lib DEBUG FORK <<< ONLY WORKS FOR LV 2012. NOT COMPATIBLE WITH 2013. Aristos Queue's first draft of a debug logger
For 2013 debugging, please take a look at Monitored Actors.