Native thread

Hi all, quick question. I’ve got my embedded ecl on a multi thread windows service. Before doing anything I call cl_boot. Then multiple request coming in served by different thread. At this point I call ecl_import_current_thread and the evaluate some lisp code with cl_safe_eval with Cnil as environment. After I call ecl_release_current_thread. Please note that those are native thread not created with gc wrapper. Are those evaluation happen in different lisp processes? Kindest regards F.