17 UserMessage Doesn't expect a reply
18 UserMessage_Recorded If no-one answers, it returns.
19 UserMessage_Acknowledge Tell Wimp we'll handle it.
Format of block :
0 length of block, including header (maximum 256 bytes)
12 your ref (0 for original message, not a reply)
16 message code
20 ..data..
Wimp_SendMessage fills out the following fields:
4 Handle of sender
8 my ref (A reply to this message will use this.)
Note: In versions of the Window Manager prior to 4.00, message blocks in dynamic areas will not have their sender and my_ref fields filled.
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