Threads within the same process share the same global variables.

Threads within a process share the same stack pointer.

For a multi-threaded process, an OS will provide a separate address space for each of its threads.

The heap is shared amongst threads of the same process.

There are no benefits to writing multi-threaded programs for uniprocessor systems since only one thread at any point in time can be executing.

In multicore systems, threads of the same process are guaranteed to be scheduled on separate cores.