Answer Posted / md moinuddin

Each process provides the resources needed to execute a
program. A process has a virtual address space, executable
code, open handles to system objects, a security context, a
unique process identifier, environment variables, a
priority class, minimum and maximum working set sizes, and
at least one thread of execution. Each process is started
with a single thread, often called the primary thread, but
can create additional threads from any of its threads.

A thread is the entity within a process that can be
scheduled for execution. All threads of a process share its
virtual address space and system resources. In addition,
each thread maintains exception handlers, a scheduling
priority, thread local storage, a unique thread identifier,
and a set of structures the system will use to save the
thread context until it is scheduled. The thread context
includes the thread's set of machine registers, the kernel
stack, a thread environment block, and a user stack in the
address space of the thread's process. Threads can also
have their own security context, which can be used for
impersonating clients.

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