We already concluded that "return to PM by triple fault" is not somethingwe want to support. It was needed only on 286 and QEMU doesn't even support 286 cpu emulation.
It is used by a whole kind of operating systems (all the 16-bit OS/2 tree) and who knows by how many DOS extenders. It is supported by Pentium processors, so it should be by QEMU, no matter it does not emulate the 286 but a later CPU.
