You're confusing shells and terminal emulators (if you can call them that under windows).

You can use the "Powershell ISE" thing as a tabbed "terminal", but Powershell itself will quite happily run under the windows console "terminal emulator".

I am indeed using the term 'Powershell' to mean both the language and the ISE/terminal. I am doing this because the authors of Powershell do the same.