What is Focus Skype and what is the WinKey?

Your computer can “focus” on only one application or window at a time. When you click in a window, your computer switches its focus to the program associated with that window. Focus Skype is a directive that tells the computer you want the main Skype window to appear. It’s kind of like summoning the genie in the bottle, but the genie is Skype.
On the keyboard of many Windows-based computers is a special key that fires up the Windows Start menu. The key, called the WinKey, looks somewhat like a wavy flag. Because the key is not generally used for anything other than summoning the Windows Start menu, it’s an ideal candidate for customized hotkeys in your applications.