ulParam1 (ULONG)

This parameter can contain any of the following flags:

MCI_NOTIFY

A notification message will be posted to the window specified in the hwndCallback parameter of the data structure pointed to by the pParam2 parameter. The notification will be posted when the action indicated by this message is completed or when an error occurs.
MCI_WAIT
Control is not to be returned until the action indicated by this message is completed or an error occurs.
MCI_SET_POSITION_ADVISE_ON
This flag specifies that position-change advise message frequency is to be set to the value specified in the ulUnits field of the MCI_POSITION_PARMS data structure.
MCI_SET_POSITION_ADVISE_OFF
This flag disables position-change advise messages.

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