Shortcut for mirroring touch bar I would like to see an emulated touchbar on my iMac. 

I randomly pressed the shotcut for it, but I don't know, which it was and I couldn't find it one the internet either. Btw., I don't use an Apple keyboard, so i.e. the fn key is missing.
You can show the Touch Bar on your screen using Xcode by choosing Window &rarr; Show Touch Bar or shift-cmd-8.