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_CLOSE_EXIT
This flag is recognized and accepted by media control drivers (MCDs); however, it should only be sent by the Media Device Manager (MDM). This flag informs the MCD that this particular close operation is coming from an exit list routine. When an MCD receives this, it will terminate in the usual way. All other threads have been terminated. When this flag is received, the MCD must assume that the current thread is the only thread in its process.

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