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NT splits the “virtual processor” into two parts:

1. A process is the unit of resource ownership.

Each process has:

• a security token,

• a virtual address space,

• a set of resources (object handles), and

• one or more threads. 2. A thread are the unit of dispatching.

Each thread has:

• a scheduling state (ready, running, etc.),

• other scheduling parameters (priority, etc),

• a context slot, and

• (generally) an associated process.

Threads are:

• co-operative: all threads in a process share address space & object handles.

• lightweight: require less work to create/delete than processes (mainly due to shared virtual address space).

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