=> R0 = buffer's flag word
R1 = start address of buffer
R2 = byte beyond end of buffer
R3 = preferred handle for the buffer, -1 to get the buffer manager to generate one
<= R0 = buffer handle
This SWI is similar to Buffer_Create, but does not claim memory for you - rather it registers your existing memory as a buffer.
See PRM 4, page 89.
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