Ping @Nikita Savchenko 

Instead of Atelier, I would recommend looking at VSCode with an extension for InterSystems. This extension in active development, while Atelier not. Look at these videos, how to install and use VSCode.

• Introduction to VSCode-ObjectScript Webinar
• ObjectScript with Visual Studio Code

In addition to already mentioned options, System will help to organize compilation order. You can prioritize some kind of system classes, which by any case have to be compiled first. By using System, DependsOn, or CompileAfter, you can correctly organize your compilation order, CompileAll should work correctly with flags `ck-u`.

In OS X, X is just a version 10, which in fact already replacing by 11 this year (after many years), and it's not just OS X, it's macOS.

And anyway, I would not recommend macOS for a production server, it's only suitable and supported for development.

Supported Server Platforms

First of all, you have to open this .code-workspace file with VSCode, it should offer to do it if you did not. Next, path is relevant to .code-workspace file location, and should contain own .vscode/settings.json. If all conditions are met, but behaviour not expected, please fill the issue, with examples, and screenshots, I'll try to reproduce and find the solution.

Could you say, what the version you use?

That’s very good to hear. As for the latest question, work in progress, and update should be available soon

Look at the project mentioned earlier.
This part

{
  "folders": [
    {
      "name": "main",
      "path": "."
    },
    {
      "name": "part1",
      "path": "part1"
    },{
      "name": "part2",
      "path": "part2"
    }
  ]
}

Mentions three folders, where part1 and part2 supposed to be used to connect to two different servers. And each folder, have own .vscode/settings.json, which contains own settings to the server.

You can reach me directly if you would need some help with VSCode, I can help with the migration process for sure, as well.

It will be more productive than looking at the Atelier way.

Is there any reasons to install Atelier which will not be updated anymore? Why do not use VSCode with extension VSCode-ObjectScript. At the moment, this is only modern and in active development editor for InterSystems products. You can download the latest file (*.vsix) with this extension here, and install in VSCode by command Install from vsix

VSCode-ObjectScript extension which I suppose you already use, support the way, to work at the same time with multiple connections. And Mathew, gives you an example how to configure it. Look at the project. Important file there is multi.code-workspace, it's a kind of project file for VSCode, where is defined two folders, and each of those folders has its own separate settings for InterSystems. So, it means each folder will have its own connection to its own server. And you can configure as many connections as you would like. With the next release, I think it will be available one more way how to achieve the same.

<Invoke Class="Security.Users" Method="AddRoles" CheckStatus="1" > 
    <Arg Value="UnknownUser"/>
    <Arg Value="Services_Role"/>
</Invoke>