SUBSTANTIAL INFORMATION ABOUT THREADS (least atleast three OS)

Windows Microsoft

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. Each process is started with a single thread, but can create additional threads from any of its threads.

For more information, see the following topics:

* Creating Threads
* Thread Stack Size
* Thread Handles and Identifiers
* Suspending Thread Execution
* Synchronizing Execution of Multiple Threads
* Multiple Threads and GDI Objects
* Thread Local Storage
* Creating Windows in Threads
* Terminating a Thread
* Thread Security and Access Rights