17 UserMessage Doesn't expect a reply
18 UserMessage_Recorded If no one answers, it returns.
19 UserMessage_Acknowledge Confirmation that UM_Recorded was received.
Format of block :
0 length of block
4 Handle of sender
8 my ref
12 your ref
16 message code
20 ..data..
To acknowledge message, first set your_ref = my_ref, and then either just call Wimp_SendMessage,19 which stops the message from returning, or send any UserMessage back to the sender.
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