Цитата ms-help://MS.PSDK.1033/dllproc/base/thread_handles_and_identifiers.htm

Windows NT 4.0 and earlier, Windows Me/98/95:  There is no way to get the thread handle from the thread identifier. If the handles were made available this way, the owning process could fail because another process unexpectedly performed an operation on one of its threads, such as suspending it, resuming it, adjusting its priority, or terminating it. Instead, you must request the handle from the thread creator or the thread itself.