View source for MM MATCHMNEMONIC

 #define [[MM_MATCHMNEMONIC]] 0x01f0

Find match of mnemonic char in menu.

; mp1 :
; SHORT1FROMMP(mp1) : character to match
; SHORT2FROMMP(mp1) : 
 number of submenu levels to search
                           0 = none
                           1 = top-level (this menu)
                           2 = top+first submenu
                           3 = top+first 2 submenus
                           (etc.)
                          -1 = all
; mp2 : pointer to HWND of menu where match found

Returns both the index of the item in the menu that matched and the
level of the match : MRFROM2SHORT (hwndmenu, index). In addition,
mp2 is updated to contain the window handle of the menu that
contained the mnemonic.

This message is sent withing the menu code when the WM_CHAR is being
processes and the menu code is trying to find a mnemonic match for the
character pressed. This message is not sent to the owner window, so
you must subclass the menu window in order to receive this message.

(Source: newsgroup)