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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
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Written by Dave Pearson