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INT 21 - Phar Lap 386/DOS-Extender - ALIAS SEGMENT DESCRIPTOR
        AX = 2513h
        BX = segment selector of descriptor in GDT or LDT
        CL = access-rights byte for alias descriptor
        CH = use-type bit (USE16 or USE32) for alias descriptor
Return: CF clear if successful
            AX = segment selector for created alias
        CF set on error
            EAX = error code
                08h insufficient memory (can't grow LDT)
                09h invalid segment selector in BX