Hello All! I have fixed this before in XEmacs 21.1. The problem is back now. I determined the number of handles remaining after each invocation of call-process by looking at the Handles column in Windows NT Task Manager using following test-case: (defun test-call-process (stdout stderr) (let ((buffer (if (numberp stderr) stdout (list stdout stderr)))) (apply 'call-process "grep" nil buffer nil (list "passangers" "c:\\winnt\\system.ini")) buffer)) (with-output-to-temp-buffer "call-process breakage" (dolist (out (list 0 t nil (get-buffer-create "*GREP*") "*GREP*")) (dolist (err '(0 t nil "STDERR.txt") "STDERR list done") (princ (format "BUFFER %40S, %d handle(s) remaining.\n" (test-call-process out err) (read-number "How many additional handles remain? " 'integer)))))) ;;;; Before conditionalizing OpenProcess() on !INTP (buffer) ;;;; and closing fd_error in Fcall_process_internal(): ;;; Some patch level of XEmacs 21.1 BUFFER 0, 1 handle(s) remaining. BUFFER (0 t), 1 handle(s) remaining. BUFFER (0 nil), 2 handle(s) remaining. BUFFER (0 "STDERR.txt"), 2 handle(s) remaining. BUFFER t, 0 handle(s) remaining. BUFFER (t t), 0 handle(s) remaining. BUFFER (t nil), 1 handle(s) remaining. BUFFER (t "STDERR.txt"), 1 handle(s) remaining. BUFFER nil, 0 handle(s) remaining. BUFFER (nil t), 0 handle(s) remaining. BUFFER (nil nil), 1 handle(s) remaining. BUFFER (nil "STDERR.txt"), 1 handle(s) remaining. BUFFER #<buffer "*GREP*">, 0 handle(s) remaining. BUFFER (#<buffer "*GREP*"> t), 0 handle(s) remaining. BUFFER (#<buffer "*GREP*"> nil), 1 handle(s) remaining. BUFFER (#<buffer "*GREP*"> "STDERR.txt"), 1 handle(s) remaining. BUFFER "*GREP*", 0 handle(s) remaining. BUFFER ("*GREP*" t), 0 handle(s) remaining. BUFFER ("*GREP*" nil), 1 handle(s) remaining. BUFFER ("*GREP*" "STDERR.txt"), 1 handle(s) remaining. ;;;; ... and after fixing this, hurrah! ;;; Some patch level of XEmacs 21.1 BUFFER 0, 0 handle(s) remaining. BUFFER (0 t), 0 handle(s) remaining. BUFFER (0 nil), 0 handle(s) remaining. BUFFER (0 "STDERR.txt"), 0 handle(s) remaining. BUFFER t, 0 handle(s) remaining. BUFFER (t t), 0 handle(s) remaining. BUFFER (t nil), 0 handle(s) remaining. BUFFER (t "STDERR.txt"), 0 handle(s) remaining. BUFFER nil, 0 handle(s) remaining. BUFFER (nil t), 0 handle(s) remaining. BUFFER (nil nil), 0 handle(s) remaining. BUFFER (nil "STDERR.txt"), 0 handle(s) remaining. BUFFER #<buffer "*GREP*">, 0 handle(s) remaining. BUFFER (#<buffer "*GREP*"> t), 0 handle(s) remaining. BUFFER (#<buffer "*GREP*"> nil), 0 handle(s) remaining. BUFFER (#<buffer "*GREP*"> "STDERR.txt"), 0 handle(s) remaining. BUFFER "*GREP*", 0 handle(s) remaining. BUFFER ("*GREP*" t), 0 handle(s) remaining. BUFFER ("*GREP*" nil), 0 handle(s) remaining. BUFFER ("*GREP*" "STDERR.txt"), 0 handle(s) remaining. (emacs-version) "XEmacs 21.2 (beta33) \"Melpomene\" [Lucid] (i586-pc-win32) of Sun May 21 2000 on ZJ75T" updated at approx. (current-time-string) "Sun May 21 00:22:56 2000" (current-time-zone) (7200 "W. Europe Daylight Time") BUFFER 0, 2 handle(s) remaining. BUFFER (0 t), 2 handle(s) remaining. BUFFER (0 nil), 2 handle(s) remaining. BUFFER (0 "STDERR.txt"), 4 handle(s) remaining. BUFFER t, 2 handle(s) remaining. BUFFER (t t), 2 handle(s) remaining. BUFFER (t nil), 2 handle(s) remaining. BUFFER (t "STDERR.txt"), 4 handle(s) remaining. BUFFER nil, 2 handle(s) remaining. BUFFER (nil t), 2 handle(s) remaining. BUFFER (nil nil), 2 handle(s) remaining. BUFFER (nil "STDERR.txt"), 4 handle(s) remaining. BUFFER #<buffer "*GREP*">, 2 handle(s) remaining. BUFFER (#<buffer "*GREP*"> t), 2 handle(s) remaining. BUFFER (#<buffer "*GREP*"> nil), 2 handle(s) remaining. BUFFER (#<buffer "*GREP*"> "STDERR.txt"), 4 handle(s) remaining. BUFFER "*GREP*", 2 handle(s) remaining. BUFFER ("*GREP*" t), 2 handle(s) remaining. BUFFER ("*GREP*" nil), 2 handle(s) remaining. BUFFER ("*GREP*" "STDERR.txt"), 4 handle(s) remaining. I probably won't have time to fix it for 21.2. Best regards, Adrian