Does Windows 2003 change the security strategy of shared memory?

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Hi all,
First some description.
A service which use the shared memory. The service use SYSTEM user.
So we could attach the shared memory using the shmid( the same as UNIX ). Under Windows 2000, it's OK to attach the shared memory the service created.
But under Windows 2003, it's not possiable to attach the shared memory even using "administrator". But if I stoped the service and started the service using command line, then I can attach the shared memory.
So what I thought is Windows 2003 has changed the security strategy. Sure?

  Thanks a lot.

Flybean
.

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