=> R0 = Pointer to array of message codes (terminated with 0 word)
Extends the set of user messages that the task gets. The initial set is given by R3 in Wimp_Initialise.
Note that prior to RISC OS 4, calling this for a task which was receiving all messages would cause it to receive only the messages added.
See also Wimp_RemoveMessages.
See PRM 3, page 226.
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