Direction
of message parameter 1.
If the message parameter is a pointer, the direction values listed below
apply to the contents of the storage location pointed at, as well
as to the message parameter itself.
RUM_IN
Input parameter (inspected by the recipient
of the message, but not altered)
RUM_OUT
Output
parameter (altered by the recipient of the message, without inspecting its
value first)
RUM_INOUT
Input/output
parameter (inspected by the recipient of the message, and then altered).
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