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Instruction - Execution (Execution environment) for a process.

A process has a self-contained execution environment that is shared among all its sub-threads

A process generally has a complete, private set of basic run-time resources allocated by the operating system, in particular, each process has:

• its own memory space (virtual memory). (for both code and data),
• file handles,
• sockets,
• device handles,
• windows,
• and a process control block

More …. see Process - Resource

It has also environment variable.

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