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### Internal and User Data Structures

The key to fully understanding such complex topics as System V IPC is to become intimately familiar with the various internal data structures that reside within the confines of the kernel itself. Direct access to some of these structures is necessary for even the most primitive operations, while others reside at a much lower level.

- Message buffer
- Kernel `msg` structure
- Kernel `msqid_ds` structure
- Kernel `ipc_perm` structure