ulParam1 (ULONG) - input
Flags for this message. These flags are defined
separately for each message; however, the following flags are available
for all media control interface messages unless denoted in the message
description. MCI_NOTIFY and MCI_WAIT are mutually exclusive.
MCI_NOTIFY
A notification message (MM_MCINOTIFY)
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 returned until the action indicated by this message is completed
or an error occurs.
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