WM_CHAR messages often contain virtual-key codes that correspond to various function keys and direction keys on a typical keyboard. These keys do not correspond to any particular glyph code but are used to initiate operations. When the KC_VIRTUALKEY flag is set in the flag word of a WM_CHAR message, the high word of mp2 contains a virtual-key code for the key.
Note: Some keys, such as the Enter key, have both a valid character code and a virtual-key code. WM_CHAR messages for these keys will contain character codes for both newline characters (ASCII 11) and virtual-key codes (VK_ENTER).