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"Running all of the existing Amiga-ported software requires you to run in the ABox mode of MorphOS."
There is no ABox or QBox mode: ABox ("AmigaBox") is one of threads running under Quark microkernel. In theory if ABox thread crash other threads and Quark would be unaffected. ABox is a sandbox.
"This mode will break the source code compatibility with AmigaOS and establish MorphOS as an independant entity (or dash it as a non-entity altogether)."
It doesnt mean it would be impossible to run old programs still since ABox would be still there. However these kinds of things wont be implemented in 1.5 or in the near future.