--- a/AbstractOperatingSystem.st	Wed Sep 04 09:00:06 2019 +0200
+++ b/AbstractOperatingSystem.st	Wed Sep 04 09:01:52 2019 +0200
@@ -994,8 +994,9 @@
      - see the description of 'sh -c' in your UNIX manual ('cmd.com' in your MSDOS manual).
      If aCommandString is an Array, the first element is the command to be executed,
      and the other elements are the arguments to the command. No shell is invoked in this case.
-     The command gets stdIn, stdOut and stdErr assigned from the arguments;
-     each may be nil.
+     The command gets stdIn, stdOut and stdErr assigned from the arguments; each may be nil.
+     If auxInStream is nonNil, it is passed as FD3 for reading;
+     if auxOutStream is nonNil, it is passed as FD4 for writing.
      Return the processId if successful, nil otherwise.
      Notice: on Unix, this id is an integer; on Windows, it is a processhandle.
      Use #monitorPid:action: for synchronization and exec status return,
@@ -1194,7 +1195,7 @@
 
 startProcess:aCommandString 
     inputFrom:anExternalInStreamOrNil outputTo:anExternalOutStreamOrNil errorTo:anExternalErrStreamOrNil 
-    auxFrom:anAuxiliaryStreamOrNil
+    auxFrom:anAuxiliaryInStreamOrNil
     environment:anEvironmentDictionary inDirectory:dir newPgrp:newPgrp showWindow:showWindowBooleanOrNil
 
     "start executing the OS command as specified by the argument, aCommandString
@@ -1203,8 +1204,8 @@
      - see the description of 'sh -c' in your UNIX manual ('cmd.com' in your MSDOS manual).
      If aCommandString is an Array, the first element is the command to be executed,
      and the other elements are the arguments to the command. No shell is invoked in this case.
-     The command gets stdIn, stdOut and stdErr assigned from the arguments;
-     each may be nil.
+     The command gets stdIn, stdOut and stdErr assigned from the arguments; each may be nil.
+     If auxInStream is nonNil, it is passed as FD3 for reading;
      Return the processId if successful, nil otherwise.
      Notice: on Unix, this id is an integer; on Windows, it is a processhandle.
      Use #monitorPid:action: for synchronization and exec status return,
@@ -1213,7 +1214,7 @@
     ^ self
         startProcess:aCommandString 
         inputFrom:anExternalInStreamOrNil outputTo:anExternalOutStreamOrNil errorTo:anExternalErrStreamOrNil 
-        auxFrom:anAuxiliaryStreamOrNil aux2To:nil
+        auxFrom:anAuxiliaryInStreamOrNil aux2To:nil
         environment:anEvironmentDictionary inDirectory:dir 
         newPgrp:newPgrp 
         showWindow:showWindowBooleanOrNil