The MCIWNDM_GETINACTIVETIMER message retrieves the update period used when the MCIWnd window is the inactive window. You can send this message explicitly or by using the MCIWndGetInactiveTimer macro.
MCIWNDM_GETINACTIVETIMER
wParam = 0;
lParam = 0L;
Returns the update period, in milliseconds. The default value is 2000 milliseconds.
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in vfw.h.
MCIWnd Window Class Overview, MCIWnd Messages, MCIWndGetInactiveTimer