Using the Core Service we can easily get a list of all the Publish Targets in the system. We might want to do this if we are creating an app to publish items to a target (like the publish window) or if we want to Decommission a Publication Target in an environment, such as when we restore a database from one environment to the next.
The following code will get a list of all PublishTargets available within the context of a Publication. If you want to get all targets in the system then using the Admin user is the best. However, if you want to use the logged on user, then see my previous article to use the Core Service as the authenticated user (for a web app).
The data returned from the GetSystemWideList call changed between 2011 and 2013, and with the code below you will get all the info from the 2013 method. Special thanks to Likhan for the tip on the Tridion StackExchange.