A parent process can use DosWaitChild to determine the termination status of a child process that is running independently. The parent process can have one of its threads call DosWaitChild to wait for completion of the child process while other threads of the parent continue processing.
If the child has started another process, DosWaitChild waits for the completion of any grandchild processes before returning, but does not report their status. If the specified child process has multiple threads, DosWaitChild returns the result code of the last DosExit request.
If there are no child processes, either active or ended with a return code, DosWaitChild returns with an error code. If no child processes have ended, DosWaitChild can optionally wait until one ends before returning to the parent.