Index: TODO
===================================================================
diff -u -rdcd56c07afd64a356db1a4672a35b4aaf4caf6ea -rac57ffc3be1f6ccef6ca5b2d5362cba07960fdc8
--- TODO	(.../TODO)	(revision dcd56c07afd64a356db1a4672a35b4aaf4caf6ea)
+++ TODO	(.../TODO)	(revision ac57ffc3be1f6ccef6ca5b2d5362cba07960fdc8)
@@ -1489,6 +1489,8 @@
 - added tcl-cool as an additional sample-object-system for nsf
 
 - changed internal method name requireNamespace to "require_namespace"
+- changed debug command __db_yield (unporable between various 8.6b* version)
+  into __db_show_stack
 
 TODO: 
 - remove TCL85STACK_TRACE and TCL85STACK_TRACE
Index: generic/gentclAPI.decls
===================================================================
diff -u -rdcd56c07afd64a356db1a4672a35b4aaf4caf6ea -rac57ffc3be1f6ccef6ca5b2d5362cba07960fdc8
--- generic/gentclAPI.decls	(.../gentclAPI.decls)	(revision dcd56c07afd64a356db1a4672a35b4aaf4caf6ea)
+++ generic/gentclAPI.decls	(.../gentclAPI.decls)	(revision ac57ffc3be1f6ccef6ca5b2d5362cba07960fdc8)
@@ -17,7 +17,7 @@
 #
 # Next Scripting commands
 #
-nsfCmd __db_yield NsfDebugYiedCmd {
+nsfCmd __db_show_stack NsfShowStackCmd {
 }
 nsfCmd __db_run_assertions NsfDebugRunAssertionsCmd {
 }
Index: generic/nsf.c
===================================================================
diff -u -r4f1c15063fb1597c9e8bd1e92a2f901cf3d73dfb -rac57ffc3be1f6ccef6ca5b2d5362cba07960fdc8
--- generic/nsf.c	(.../nsf.c)	(revision 4f1c15063fb1597c9e8bd1e92a2f901cf3d73dfb)
+++ generic/nsf.c	(.../nsf.c)	(revision ac57ffc3be1f6ccef6ca5b2d5362cba07960fdc8)
@@ -11705,18 +11705,12 @@
  * Begin generated Next Scripting commands
  *******************************************/
 /*
-nsfCmd __db__yield NsfDebugYiedCmd {
+nsfCmd __db_show_stack NsfShowStackCmd {
 }
 */
 static int
-NsfDebugYiedCmd(Tcl_Interp *interp) {
-#if defined(NRE)
-  //Interp *iPtr = (Interp *)interp;
-  //CoroutineData *corPtr = iPtr->execEnvPtr->corPtr;
-
+NsfShowStackCmd(Tcl_Interp *interp) {
   TclShowStack(interp);
-  //fprintf(stderr, "stackLevel: %p %d\n", corPtr->stackLevel, *corPtr->stackLevel);
-#endif
   return TCL_OK;
 }
 
Index: generic/tclAPI.h
===================================================================
diff -u -rdcd56c07afd64a356db1a4672a35b4aaf4caf6ea -rac57ffc3be1f6ccef6ca5b2d5362cba07960fdc8
--- generic/tclAPI.h	(.../tclAPI.h)	(revision dcd56c07afd64a356db1a4672a35b4aaf4caf6ea)
+++ generic/tclAPI.h	(.../tclAPI.h)	(revision ac57ffc3be1f6ccef6ca5b2d5362cba07960fdc8)
@@ -161,7 +161,6 @@
 static int NsfCreateObjectSystemCmdStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv []);
 static int NsfCurrentCmdStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv []);
 static int NsfDebugRunAssertionsCmdStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv []);
-static int NsfDebugYiedCmdStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv []);
 static int NsfDeprecatedCmdStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv []);
 static int NsfDispatchCmdStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv []);
 static int NsfExistsVarCmdStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv []);
@@ -182,6 +181,7 @@
 static int NsfRelationCmdStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv []);
 static int NsfSetVarCmdStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv []);
 static int NsfSetterCmdStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv []);
+static int NsfShowStackCmdStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv []);
 static int NsfOAutonameMethodStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv []);
 static int NsfOCleanupMethodStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv []);
 static int NsfOConfigureMethodStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv []);
@@ -244,7 +244,6 @@
 static int NsfCreateObjectSystemCmd(Tcl_Interp *interp, Tcl_Obj *rootClass, Tcl_Obj *rootMetaClass, Tcl_Obj *systemMethods);
 static int NsfCurrentCmd(Tcl_Interp *interp, int currentoption);
 static int NsfDebugRunAssertionsCmd(Tcl_Interp *interp);
-static int NsfDebugYiedCmd(Tcl_Interp *interp);
 static int NsfDeprecatedCmd(Tcl_Interp *interp, CONST char *what, CONST char *oldCmd, CONST char *newCmd);
 static int NsfDispatchCmd(Tcl_Interp *interp, NsfObject *object, int withObjscope, Tcl_Obj *command, int nobjc, Tcl_Obj *CONST nobjv[]);
 static int NsfExistsVarCmd(Tcl_Interp *interp, NsfObject *object, CONST char *var);
@@ -265,6 +264,7 @@
 static int NsfRelationCmd(Tcl_Interp *interp, NsfObject *object, int relationtype, Tcl_Obj *value);
 static int NsfSetVarCmd(Tcl_Interp *interp, NsfObject *object, Tcl_Obj *variable, Tcl_Obj *value);
 static int NsfSetterCmd(Tcl_Interp *interp, NsfObject *object, int withPer_object, Tcl_Obj *parameter);
+static int NsfShowStackCmd(Tcl_Interp *interp);
 static int NsfOAutonameMethod(Tcl_Interp *interp, NsfObject *obj, int withInstance, int withReset, Tcl_Obj *name);
 static int NsfOCleanupMethod(Tcl_Interp *interp, NsfObject *obj);
 static int NsfOConfigureMethod(Tcl_Interp *interp, NsfObject *obj, int objc, Tcl_Obj *CONST objv[]);
@@ -328,7 +328,6 @@
  NsfCreateObjectSystemCmdIdx,
  NsfCurrentCmdIdx,
  NsfDebugRunAssertionsCmdIdx,
- NsfDebugYiedCmdIdx,
  NsfDeprecatedCmdIdx,
  NsfDispatchCmdIdx,
  NsfExistsVarCmdIdx,
@@ -349,6 +348,7 @@
  NsfRelationCmdIdx,
  NsfSetVarCmdIdx,
  NsfSetterCmdIdx,
+ NsfShowStackCmdIdx,
  NsfOAutonameMethodIdx,
  NsfOCleanupMethodIdx,
  NsfOConfigureMethodIdx,
@@ -948,24 +948,6 @@
 }
 
 static int
-NsfDebugYiedCmdStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
-  ParseContext pc;
-
-  if (ArgumentParse(interp, objc, objv, NULL, objv[0], 
-                     method_definitions[NsfDebugYiedCmdIdx].paramDefs, 
-                     method_definitions[NsfDebugYiedCmdIdx].nrParameters, 1,
-                     &pc) != TCL_OK) {
-    return TCL_ERROR;
-  } else {
-    
-
-    ParseContextRelease(&pc);
-    return NsfDebugYiedCmd(interp);
-
-  }
-}
-
-static int
 NsfDeprecatedCmdStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
   ParseContext pc;
 
@@ -1363,6 +1345,24 @@
 }
 
 static int
+NsfShowStackCmdStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
+  ParseContext pc;
+
+  if (ArgumentParse(interp, objc, objv, NULL, objv[0], 
+                     method_definitions[NsfShowStackCmdIdx].paramDefs, 
+                     method_definitions[NsfShowStackCmdIdx].nrParameters, 1,
+                     &pc) != TCL_OK) {
+    return TCL_ERROR;
+  } else {
+    
+
+    ParseContextRelease(&pc);
+    return NsfShowStackCmd(interp);
+
+  }
+}
+
+static int
 NsfOAutonameMethodStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
   ParseContext pc;
   NsfObject *obj =  (NsfObject *)clientData;
@@ -2125,9 +2125,6 @@
 {"::nsf::__db_run_assertions", NsfDebugRunAssertionsCmdStub, 0, {
   }
 },
-{"::nsf::__db_yield", NsfDebugYiedCmdStub, 0, {
-  }
-},
 {"::nsf::deprecated", NsfDeprecatedCmdStub, 3, {
   {"what", 1, 0, ConvertToString},
   {"oldCmd", 1, 0, ConvertToString},
@@ -2230,6 +2227,9 @@
   {"-per-object", 0, 0, ConvertToString},
   {"parameter", 0, 0, ConvertToTclobj}}
 },
+{"::nsf::__db_show_stack", NsfShowStackCmdStub, 0, {
+  }
+},
 {"::nsf::cmd::Object::autoname", NsfOAutonameMethodStub, 3, {
   {"-instance", 0, 0, ConvertToString},
   {"-reset", 0, 0, ConvertToString},