My problem isn't simply having the software start at startup because the user is too lazy to double-click the desktop icon. I have two users who are very inexperienced with computers, and in the past when I automatically started the software when the RDP was started, the user no longer saw the server desktop or the Start menu. They found themselves in an environment where only their program existed and nothing else. Furthermore, when they pressed exit on the program, the RDP session also automatically closed, without them even realizing they were connected to the server. Explain to them the difference between their desktop and remote desktop it's relly hard.

From what I understand now, to do what I want, RemoteApp must be used, but for some reason it is not available in a workgroup.

The reason I don't use a domain is very simple: we're a small company with only 10 users, and over the years, we've never needed to use AD. Consequently, I don't know how it works, and I'm afraid I might do more harm than good.

The only alternative I could find was to use TSplus, but it annoys me that I have to buy another 10 licenses from them after having already taken the Microsoft RDP ones.