mapping shared memory from another QNX box?

Hi, I have a two QNX box. I would like to map a shared memory that is created in one box from another box. Is this possible?
I have qnet running on both box and am able to see them in /net directory. The shm_open() seems to find the shared memory ok but it fails during mmap() command.

Thanks

memory can be shared only between processes on the same node