* R0 = Client handle for this task.
* All registers preserved.
Purpose: Claim the most recently read message.
Interrupts: Interrupt status is undefined.
Fast interrupts are enabled.
Processor mode: Processor is in SVC mode.
Re-entrancy: SWI is not re-entrant.
Use: After reading a message with ARMEdit_TalkRX, this call should be
used to claim the message, and to prevent it being offered to other
clients. This should be used before calling any other SWIs from this
module.
If the message was sent by the ARMEdit module then calling this SWI
has no effect; other clients still receive the message.
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