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_FIND_BEST_REGISTERED
Select the best palette from the registered color maps and return its ID in the usRegisteredMap field of the MCI_PALETTE_PARMS data structure.
MCI_QUERY_REGISTERED_MAP
This flag specifies that the palette specified in the usRegisteredMap field is to be returned in the array specified in the pPalette field. The size of the palette is returned in the ulPalEntries field.
MCI_QUERY_REGISTERED_MAP_SIZE
This flag specifies that the size of the palette specified in the usRegisteredMap field is to be returned in the ulPalEntries field. This can be used to determine the size of the array to use for MCI_QUERY_REGISTERED_MAP.

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