IE 11 compatibility mode

IE 11 comes with Windows 8.1 removed the compatibility mode button on the user interface, it may impact lots of in-house application that is not IE7 or about ready.  There is work around on this and do not stop using Windows 8.1 in the environment,

For normal user, from IE tool menu, goes to Compatibility view list, add the domain of the URL that require compatibility mode.

For developer, press F12 to turn on debug mode, that allows to switch from IE11 to different IE standard edition.