You are running some complex work flow or Action on a large PDF document in Adobe Acrobat Professional and it hangs preventing you from working on another PDF document, in parallel.
Your Acrobat process crashes (feel lucky for being an audience to a rare phenomena 🙂 ), taking down unsaved work and you wish you could ‘sandbox’ the critical work from the regular work.
Because of a troublesome PDF document, you have to end the Acrobat.exe process using the Windows Task Manager. You wish other open PDF documents remain open and unaffected.
You are commenting in and annotating one PDF, while referring to another and do not want your comment to auto-close.
If you relate to such instances, launch multiple instances of Acrobat, as different processes using acrobat /n command.