In Windows, it is easy to run more than one instance of an application, with each running in it’s own memory space. If you wanted to run two versions of Notepad and have both open at the same time, or FileZilla in this example, this is how to do it.
1. Start the first instance of the program. It’s as simple as launching the program. You may already have it running.
2. Hold Shift and Left click the program icon in the Taskbar.
3. A new instance of the program will start, running as it’s own task and in it’s own memory space.