Посмотреть в MSDN:
Цитата | Parameters
nCode [in] Specifies a code the hook procedure uses to determine how to process the message. If nCode is less than zero, the hook procedure must pass the message to the CallNextHookEx function without further processing and should return the value returned by CallNextHookEx. This parameter can be one of the following values. HC_ACTION The wParam and lParam parameters contain information about a mouse message. HC_NOREMOVE The wParam and lParam parameters contain information about a mouse message, and the mouse message has not been removed from the message queue. (An application called the PeekMessage function, specifying the PM_NOREMOVE flag.) wParam [in] Specifies the identifier of the mouse message. lParam [in] Pointer to a MOUSEHOOKSTRUCT structure.
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