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Each message which is sent to a window procedure has two data items which
serve as arguments to that message. The two items are a word-long item,
wParam, and  double-word-long item, lParam. The lParam argument is
ocassionally subdivided into two word-long parameters. These word can be
extracted using the LOWORD(lParam) and the HIWORD(lParam) macros.

 WM_ACTIVATE
 WM_BORDER
 WM_CHAR
 WM_CLEAR
 WM_CLOSE
 WM_COMMAND
 WM_COPY
 WM_CREATE
 WM_CUT
 WM_DESTROY
 WM_DEVMODECHANGE
 WM_ENABLE
 WM_ERASEBKGND
 WM_GETDLGCODE
 WM_GETID
 WM_GETMINMAXINFO
 WM_GETTEXT
 WM_GETTEXTLENGTH
 WM_HSCROLL
 WM_INITDIALOG
 WM_INITMENUPOPUP
 WM_KILLFOCUS
 WM_LBUTTONDBLCLK
 WM_LBUTTONDOWN
 WM_LBUTTONUP
 WM_MBUTTONDBLCLK
 WM_MBUTTONDOWN
 WM_MBUTTONUP
 WM_MENUCHAR
 WM_MENUSELECT
 WM_MOUSEACTIVATE
 WM_MOUSEMOVE
 WM_MOVE
 WM_NCACTIVATE
 WM_NCHITTEST
 WM_NCPAINT
 WM_PAINT
 WM_PASTE
 WM_QUIT
 WM_RBUTTONDBLCLK
 WM_RBUTTONDOWN
 WM_RBUTTONUP
 WM_SETFOCUS
 WM_SETID
 WM_SETTEXT
 WM_SETVISIBLE
 WM_SHADOW
 WM_SIZE
 WM_SYSCOMMAND
 WM_SYSTEMERROR
 WM_TIMER
 WM_VSCROLL