How to share memory between different VMs?

Hi, dear all!
I don't know if it is possible to share memory between different VMs. I know its easy for threads. Now my problem is that I want to start serveral applications which share only one copy of data, I don't know what's the right way to do that.
Thanx

They are some volume data for visualization. I want to
serveral rendering servers on a single machine, the
data size can be up to 1024*1024*1024 ( or even larger
I don't know if I HAVE TO use threads in order to
share the data, however, threads are not preemptive as
processes I think, is that true?
Not really sure what that has to do with it.
I believe the VMs for most common OSes use preemptive thread scheduling. I know windows does and I am rather certain that solaris/linux also do that.
A number of suggestions were made above for your problem. Memory mapped files allow multiple VMs if memory mapped files work for your VM/OS. Or you can use a single VM.
Given that your dataset is 1 gig or larger you might want to keep in mind the limitations of modern OSes. Windows for example will not normally allow any application to have a process space larger than 2 gigs. And on all OSes the VM heap limitations for 32-bit VMs are below 2 gigs by several hundred mega-bytes.

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