diff --git a/apps/examples/elf/elf_main.c b/apps/examples/elf/elf_main.c
index 66a47592c8..2b5c0eb5eb 100644
--- a/apps/examples/elf/elf_main.c
+++ b/apps/examples/elf/elf_main.c
@@ -321,7 +321,7 @@ int elf_main(int argc, char *argv[])
 
       /* Execute the ELF module */
 
-      ret = exec_module(&bin, 50);
+      ret = exec_module(&bin);
 
       mm_update(&g_mmstep, "after exec_module");
 
diff --git a/apps/examples/nxflat/nxflat_main.c b/apps/examples/nxflat/nxflat_main.c
index 536bc1dd82..0c4846a5cc 100644
--- a/apps/examples/nxflat/nxflat_main.c
+++ b/apps/examples/nxflat/nxflat_main.c
@@ -243,7 +243,7 @@ int nxflat_main(int argc, char *argv[])
 
       /* Execute the ELF module */
 
-      ret = exec_module(&bin, 50);
+      ret = exec_module(&bin);
       if (ret < 0)
         {
           err("ERROR: Failed to execute program '%s'\n", dirlist[i]);
diff --git a/nuttx/Documentation/NuttXBinfmt.html b/nuttx/Documentation/NuttXBinfmt.html
index 9c9fd3a510..7528b188bc 100644
--- a/nuttx/Documentation/NuttXBinfmt.html
+++ b/nuttx/Documentation/NuttXBinfmt.html
@@ -8,7 +8,7 @@
   <tr align="center" bgcolor="#e4e4e4">
     <td>
       <h1><big><font color="#3c34ec"><i>NuttX Binary Loader</i></font></big></h1>
-      <p>Last Updated: December 17, 2012</p>
+      <p>Last Updated: January 16, 2013</p>
     </td>
   </tr>
 </table>
@@ -141,7 +141,7 @@ struct binary_s
 {
   /* Information provided to the loader to load and bind a module */
 
-  FAR const char *filename;            /* Full path to the binary to be loaded<sup>1</sup> */
+  FAR const char *filename;            /* Full path to the binary to be loaded */
   FAR const char **argv;               /* Argument list */
   FAR const struct symtab_s *exports;  /* Table of exported symbols */
   int nexports;                        /* The number of symbols in exports[] */
@@ -153,13 +153,33 @@ struct binary_s
   main_t entrypt;                      /* Entry point into a program module */
   FAR void *mapped;                    /* Memory-mapped, address space */
   FAR void *alloc[BINFMT_NALLOC];      /* Allocated address spaces */
+
+  /* Constructors/destructors */
+
 #ifdef CONFIG_BINFMT_CONSTRUCTORS
   FAR binfmt_ctor_t *ctors;            /* Pointer to a list of constructors */
   FAR binfmt_dtor_t *dtors;            /* Pointer to a list of destructors */
   uint16_t nctors;                     /* Number of constructors in the list */
   uint16_t ndtors;                     /* Number of destructors in the list */
 #endif
+
+  /* Address environment.
+   *
+   * addrenv - This is the handle created by up_addrenv_create() that can be
+   *   used to manage the tasks address space.
+   */
+
+#ifdef CONFIG_ADDRENV
+  task_addrenv_t addrenv;              /* Task address environment */
+#endif
+
   size_t mapsize;                      /* Size of the mapped address region (needed for munmap) */
+
+  /* Start-up information that is provided by the loader, but may be modified
+   * by the caller between load_module() and exec_module() calls.
+   */
+
+  uint8_t priority;                    /* Task execution priority */
   size_t stacksize;                    /* Size of the stack in bytes (unallocated) */
 };
 </pre></ul>
@@ -291,7 +311,7 @@ This is a NuttX internal function so it follows the convention that 0 (<code>OK<
 <p><b>Function Prototype:</b></p>
 <ul><pre>
 #include &lt:nuttx/binfmt/binfmt.h&gt;
-int exec_module(FAR const struct binary_s *bin, int priority);
+int exec_module(FAR const struct binary_s *bin);
 </pre></ul>
 <p><b>Description:</b></p>
 <ul>
diff --git a/nuttx/Documentation/NuttXNxFlat.html b/nuttx/Documentation/NuttXNxFlat.html
index 3a2ed80460..ed04f7f773 100644
--- a/nuttx/Documentation/NuttXNxFlat.html
+++ b/nuttx/Documentation/NuttXNxFlat.html
@@ -668,7 +668,7 @@ cat ../syscall/syscall.csv ../libc/lib.csv | sort >tmp.csv
 </p>
 </ul>
 
-<p><b><code>int exec_module(FAR const struct binary_s *bin, int priority)</code></b>
+<p><b><code>int exec_module(FAR const struct binary_s *bin)</code></b>
 <ul>
 <p><b>Description:</b>
   Execute a module that has been loaded into memory by load_module().
diff --git a/nuttx/binfmt/binfmt_exec.c b/nuttx/binfmt/binfmt_exec.c
index d5e2747103..d878c8cc50 100644
--- a/nuttx/binfmt/binfmt_exec.c
+++ b/nuttx/binfmt/binfmt_exec.c
@@ -40,7 +40,6 @@
 #include <nuttx/config.h>
 
 #include <string.h>
-#include <sched.h>
 #include <debug.h>
 #include <errno.h>
 
@@ -75,8 +74,7 @@
  *
  * Description:
  *   This is a convenience function that wraps load_ and exec_module into
- *   one call.  The priority of the executed program is set to be the
- *   same as the priority of the calling thread.
+ *   one call.
  *
  * Input Parameter:
  *   filename - Fulll path to the binary to be loaded
@@ -95,18 +93,8 @@ int exec(FAR const char *filename, FAR const char **argv,
          FAR const struct symtab_s *exports, int nexports)
 {
   struct binary_s bin;
-  struct sched_param param;
   int ret;
 
-  /* Get the priority of this thread */
-
-  ret = sched_getparam(0, &param);
-  if (ret < 0)
-    {
-      bdbg("ERROR: sched_getparam failed: %d\n", errno);
-      return ERROR;
-    }
-  
   /* Load the module into memory */
 
   memset(&bin, 0, sizeof(struct binary_s));
@@ -121,9 +109,9 @@ int exec(FAR const char *filename, FAR const char **argv,
       return ERROR;
     }
 
-  /* Then start the module at the priority of this thread */
+  /* Then start the module */
 
-  ret = exec_module(&bin, param.sched_priority);
+  ret = exec_module(&bin);
   if (ret < 0)
     {
       bdbg("ERROR: Failed to execute program '%s'\n", filename);
diff --git a/nuttx/binfmt/binfmt_execmodule.c b/nuttx/binfmt/binfmt_execmodule.c
index df8da53435..afa445abb9 100644
--- a/nuttx/binfmt/binfmt_execmodule.c
+++ b/nuttx/binfmt/binfmt_execmodule.c
@@ -144,7 +144,7 @@ static inline int exec_ctors(FAR const struct binary_s *binp)
  *
  ****************************************************************************/
 
-int exec_module(FAR const struct binary_s *binp, int priority)
+int exec_module(FAR const struct binary_s *binp)
 {
   FAR _TCB     *tcb;
 #ifndef CONFIG_CUSTOM_STACK
@@ -187,12 +187,12 @@ int exec_module(FAR const struct binary_s *binp, int priority)
 
   /* Initialize the task */
 
-  ret = task_init(tcb, binp->filename, priority, stack,
+  ret = task_init(tcb, binp->filename, binp->priority, stack,
                   binp->stacksize, binp->entrypt, binp->argv);
 #else
   /* Initialize the task */
 
-  ret = task_init(tcb, binp->filename, priority, stack,
+  ret = task_init(tcb, binp->filename, binp->priority, stack,
                   binp->entrypt, binp->argv);
 #endif
   if (ret < 0)
diff --git a/nuttx/binfmt/binfmt_loadmodule.c b/nuttx/binfmt/binfmt_loadmodule.c
index 112a6b35b1..4f3dc69524 100644
--- a/nuttx/binfmt/binfmt_loadmodule.c
+++ b/nuttx/binfmt/binfmt_loadmodule.c
@@ -66,6 +66,39 @@
  * Private Functions
  ****************************************************************************/
 
+/****************************************************************************
+ * Name: load_default_priority
+ *
+ * Description:
+ *   Set the default priority of the module to be loaded.  This may be
+ *   changed (1) by the actions of the binary format's load() method if
+ *   the binary format contains priority informaition, or (2) by the user
+ *   between calls to load_module() and exec_module().
+ *
+ * Returned Value:
+ *   Zero (OK) is returned on success; Otherwise, -1 (ERROR) is returned and
+ *   the errno variable is set appropriately.
+ *
+ ****************************************************************************/
+
+static int load_default_priority(FAR struct binary_s *bin)
+{
+  struct sched_param param;
+
+  /* Get the priority of this thread */
+
+  ret = sched_getparam(0, &param);
+  if (ret < 0)
+    {
+      bdbg("ERROR: sched_getparam failed: %d\n", errno);
+      return ERROR;
+    }
+  
+  /* Save that as the priority of child thread */
+
+  bin->priority = param.sched_priority;
+}
+
 /****************************************************************************
  * Name: load_absmodule
  *
@@ -145,6 +178,16 @@ int load_module(FAR struct binary_s *bin)
   if (bin && bin->filename)
 #endif
     {
+      /* Set the default priority of the new program. */
+
+      ret = load_default_priority(bin)
+      if (ret < 0)
+        {
+          /* The errno is already set in this case */
+
+          return ERROR;
+        }
+
       /* Were we given a relative path?  Or an absolute path to the file to
        * be loaded?  Absolute paths start with '/'.
        */
diff --git a/nuttx/binfmt/builtin.c b/nuttx/binfmt/builtin.c
index e591ebea82..d36cb63265 100644
--- a/nuttx/binfmt/builtin.c
+++ b/nuttx/binfmt/builtin.c
@@ -136,6 +136,7 @@ static int builtin_loadbinary(struct binary_s *binp)
 
   binp->entrypt   = g_builtins[index].main;
   binp->stacksize = g_builtins[index].stacksize;
+  binp->priority  = g_builtins[index].priority;
   return OK;
 }
 
diff --git a/nuttx/binfmt/libbuiltin/Make.defs b/nuttx/binfmt/libbuiltin/Make.defs
index 96e8b6c37b..5eec1acde4 100644
--- a/nuttx/binfmt/libbuiltin/Make.defs
+++ b/nuttx/binfmt/libbuiltin/Make.defs
@@ -41,9 +41,9 @@ BINFMT_CSRCS += builtin.c
 
 # Builtin library interfaces
 
-BINFMT_CSRCS += libbuiltin_utils.c
+BINFMT_CSRCS += libbuiltin_getname.c libbuiltin_isavail.c
 
-# Hook the libelf subdirectory into the build
+# Hook the libbuiltin subdirectory into the build
 
 VPATH += libbuiltin
 SUBDIRS += libbuiltin
diff --git a/nuttx/binfmt/libbuiltin/libbuiltin_getname.c b/nuttx/binfmt/libbuiltin/libbuiltin_getname.c
new file mode 100644
index 0000000000..01ac024f7a
--- /dev/null
+++ b/nuttx/binfmt/libbuiltin/libbuiltin_getname.c
@@ -0,0 +1,92 @@
+/****************************************************************************
+ * binfmt/libbuiltin/libbuiltin_getname.c
+ *
+ * Originally by:
+ *
+ *   Copyright (C) 2011 Uros Platise. All rights reserved.
+ *   Author: Uros Platise <uros.platise@isotel.eu>
+ *
+ * With subsequent updates, modifications, and general maintenance by:
+ *
+ *   Copyright (C) 2012-2013 Gregory Nutt.  All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <nuttx/binfmt/builtin.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: builtin_getname
+ *
+ * Description:
+ *   Return the name of the application at index in the table of builtin
+ *   applications.
+ *
+ ****************************************************************************/
+
+FAR const char *builtin_getname(int index)
+{
+  if (index < 0 || index >= number_builtins())
+   {
+     return NULL;
+   }
+
+  return g_builtins[index].name;
+}
diff --git a/nuttx/binfmt/libbuiltin/libbuiltin_utils.c b/nuttx/binfmt/libbuiltin/libbuiltin_isavail.c
similarity index 88%
rename from nuttx/binfmt/libbuiltin/libbuiltin_utils.c
rename to nuttx/binfmt/libbuiltin/libbuiltin_isavail.c
index b53becff93..f99a4b81d5 100644
--- a/nuttx/binfmt/libbuiltin/libbuiltin_utils.c
+++ b/nuttx/binfmt/libbuiltin/libbuiltin_isavail.c
@@ -1,5 +1,5 @@
 /****************************************************************************
- * binfmt/libbuiltin/libbuiltin_utils.c
+ * binfmt/libbuiltin/libbuiltin_isavail.c
  *
  * Originally by:
  *
@@ -76,25 +76,6 @@
  * Public Functions
  ****************************************************************************/
 
-/****************************************************************************
- * Name: builtin_getname
- *
- * Description:
- *   Return the name of the application at index in the table of builtin
- *   applications.
- *
- ****************************************************************************/
-
-FAR const char *builtin_getname(int index)
-{
-  if (index < 0 || index >= number_builtins())
-   {
-     return NULL;
-   }
-
-  return g_builtins[index].name;
-}
-
 /****************************************************************************
  * Name: builtin_isavail
  *
diff --git a/nuttx/configs/sim/README.txt b/nuttx/configs/sim/README.txt
index 6e124a3a18..67ff730197 100644
--- a/nuttx/configs/sim/README.txt
+++ b/nuttx/configs/sim/README.txt
@@ -290,6 +290,16 @@ nsh
   2. This version has one builtin function:  This configuration:
      apps/examples/hello.
 
+  3. This configuration has BINFS enabled so that the builtin applications
+     can be made visible in the file system.  For example:
+
+     NuttShell (NSH) NuttX-6.24
+     nsh> mount -t binfs /bin
+     nsh> ls /bin
+     /bin:
+       hello
+     nsh> 
+
 nsh2
 
   Description
diff --git a/nuttx/include/nuttx/binfmt/binfmt.h b/nuttx/include/nuttx/binfmt/binfmt.h
index 480e82c09f..c6c7c874a7 100644
--- a/nuttx/include/nuttx/binfmt/binfmt.h
+++ b/nuttx/include/nuttx/binfmt/binfmt.h
@@ -117,6 +117,12 @@ struct binary_s
 #endif
 
   size_t mapsize;                      /* Size of the mapped address region (needed for munmap) */
+
+  /* Start-up information that is provided by the loader, but may be modified
+   * by the caller between load_module() and exec_module() calls.
+   */
+
+  uint8_t priority;                    /* Task execution priority */
   size_t stacksize;                    /* Size of the stack in bytes (unallocated) */
 };
 
@@ -221,15 +227,14 @@ int unload_module(FAR const struct binary_s *bin);
  *
  ****************************************************************************/
 
-int exec_module(FAR const struct binary_s *bin, int priority);
+int exec_module(FAR const struct binary_s *bin);
 
 /****************************************************************************
  * Name: exec
  *
  * Description:
  *   This is a convenience function that wraps load_ and exec_module into
- *   one call.  The priority of the executed program is set to be the
- *   same as the priority of the calling thread.
+ *   one call.
  *
  * Input Parameter:
  *   filename - Fulll path to the binary to be loaded