Owner's Manual

 To press the euro sign on an UK keyboard, hold down the Alt Gr key and
press 4 (which has an euro sign on it).
Windows Keys
The keyboard has two keys that perform Windows-specific functions:
Windows Logo key and Application key.
The Windows Logo key opens the Start menu and performs
software-specific functions when used in combination with other keys. The
Application key usually has the same effect as a right mouse click. (See
your Windows manual for more information.)