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MCI_STEP
 
        This MCI command message steps the player one or more frames.
 
Parameters
        DWORD dwFlags
            The following flags apply to all devices supporting
            MCI_STEP:
 
            MCI_NOTIFY
                Specifies that MCI should post the MM_MCINOTIFY message
                when this command completes. The window to receive this
                message is specified in the dwCallback field of the data
                structure identified by lpStep.
 
            MCI_WAIT
                Specifies that the step operation should finish before
                MCI returns control to the application.
 
        Animation Extensions
 
        DWORD dwFlags
            The following additional flag applies to animation devices.
 
            MCI_ANIM_STEP_FRAMES
                Indicates that the dwFrames field of the data structure
                identified by lpStep specifies the number of frames to
                step.
 
            MCI_ANIM_STEP_REVERSE
                Steps in reverse.
 
        LPMCI_ANIM_STEP_PARMS lpStep
            Specifies a far pointer to the MCI_ANIM_STEP_PARMS data
            structure.
 
        Videodisc Extensions
 
        DWORD dwFlags
            The following additional flag applies to videodisc devices.
 
            MCI_VD_STEP_FRAMES
                Indicates that the dwFrames field of the data structure
                identified by lpStep specifies the number of frames to
                step.
 
            MCI_VD_STEP_REVERSE
                Steps in reverse.
 
        LPMCI_VD_STEP_PARMS lpStep
            Specifies a far pointer to the MCI_VD_STEP_PARMS data
            structure.
 
Return value
        Returns zero if successful. Otherwise, it returns an MCI error
        code.
 
Comments
        Only devices that return TRUE to the MCI_GETDEVCAPS_HAS_VIDEO
        capability query support this command at present.
 
See also
        MCI_CUE, MCI_PLAY, MCI_SEEK
 
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