* R0 = Client handle for this task.
R1 = The client handle for the recipient.
R2 ! Block containing the message to send.
* All registers preserved.
Purpose: Reply to a message from another client task.
Interrupts: Interrupt status is undefined.
Fast interrupts are enabled.
Processor mode: Processor is in SVC mode.
Re-entrancy: SWI is not re-entrant.
Use: This is like ARMEdit_TalkTX, except that the message is stored in the
destination task's message buffer. The destination task must be
specified by it's client handle; it is not possible to send the
message to an ID.
The main use of this call is to support the easy creation of RISC OS
tasks acting as a server for multiple PC tasks.
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