Classy Hatter

If you want to confirm that, launch one or all of your WinBoat apps. While they are running, run pidof windows. If that gave some pids, run pstree -sp <pid>. That command shows the parent processes, with their pids, of the <pid> . WinBoat probably should be among the parents of the “windows” process.

4 hours is unhealthy for most humans. If you consume caffeine (coffee, energy drinks, etc.) it can affect your sleep.

/proc is a special directory that is populated by procfs, a special kind of filesystem. It contains information about running processes. Each sub-directory contains information for one process. When you launch an application, it’s assigned some process id. Every time you launch the application, it gets a different process id.

You can try and find the application by running which windows. If the application is in your PATH, that tells where it is.

That command only killed the process, in other words, it “closed the program”. Rebooting the computer would have had the same exact effect. The application is still in your computer, unless it decided to self-destruct.