regardless of the pointer size. The first object in the list
is the object to receive the message.
+ Objects which live in this address space have the high bit
+ clear; remote objects have the high bit set. When sending an
+ object reference that has not been exposed to the kernel
+ before, the new_object() syscall must first be called.
+
num_segments 32-bit Number of data segments
segment.ptr pointer Pointer to data segment