The entities for the which the OS maintains a table of information management are memory tables, I/O tables as well as process tables. The Operating System typically maintains table of information management for things like memory tables, I/O tables, and process tables for reasons I have explained below:
Memory tables: This is used to keep track of real and virtual memory
I/O tables: I/O tables by implication is used by OS to manage I/O devices and channels of the computer system
Process tables: The process table manage processes. This process information is particularly useful as it serves as the central organizational element for the OS to handle all the started processes.
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