Hi there,

I just did a quick check by simply adding a little code to one of my plugins like this:

var controller = SdlTradosStudio.Application.GetController<ProjectsController>();
var cur = controller.CurrentProject;
var sel = controller.SelectedProjects.FirstOrDefault();
var curname = cur != null ? cur.GetProjectInfo().Name : "NULL";
var selname = sel != null ? sel.GetProjectInfo().Name : "NULL";

MessageBox.Show($"Current project: {curname}\r\nSelected: {selname}");

Then I double clicked one project in the projects list to make it bold and current. I double clicked to open files view, then opened that file in editor.

Then I triggered my code from projects view, from files view, and from editor. In all cases it always showed me the one bold formatted project, whose file is displayed in the files view as well as in the editor as "Current" and any project that I had selected by single clicking it in the projects view as the "Selected". When I had not selected any (click in an empty area in projectlist to clear selection) it displayed my current project as usual and NULL for selected project.

So, yes, there is a clear distinction, and yes, you can rely on it pretty well.

Hope this helps.
Andreas