Where is the ‘ad hoc’ wireless connection feature in Windows 8 and Windows 8.1

If you 'upgraded' from Windows 7 to Windows 8 or directly to Windows 8.1, you might have noticed that ad hoc Wi-Fi (computer-computer) connections are no longer available.  The user interface for setting up an ad hoc connection does not exist any more in the Network and Sharing Center. This can be a bit disappointing. However, with Windows 7 itself, a substitute feature was introduced which is a better replacement for ad hoc wireless connections.