In order to allow future theoretical interoperability and generally avoid problems, Theo is trying to coordinate with the ReactOS folks regarding SWI bases.
SWIs, or SoftWare Interrupts in the ARM world are generally means for invoking system calls. RISC OS and other ARM operating systems use certain allocated ranges. ReactOS is a from-scratch operating system, which aims to re-implement the Windows architecture, and has now started an ARM port.
The impetus was a documentation discussion on the ROOL forums.
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