ulParam1 (ULONG)

This parameter can contain any of the following flags: The MCI_SPIN_UP and MCI_SPIN_DOWN flags are mutually exclusive.

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_SPIN_UP
This flag starts the disc spinning.
MCI_SPIN_DOWN
This flag stops the disc from spinning.

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