diff --git a/boot/cedit.c b/boot/cedit.c
index 5758cc5..cd935d4 100644
--- a/boot/cedit.c
+++ b/boot/cedit.c
@@ -154,7 +154,7 @@
 	struct video_priv *vid_priv;
 	uint scene_id;
 	struct scene *scn;
-	bool done;
+	bool done, save;
 	int ret;
 
 	cli_ch_init(cch);
@@ -164,6 +164,7 @@
 	scene_id = ret;
 
 	done = false;
+	save = false;
 	do {
 		struct expo_action act;
 		int ichar, key;
@@ -208,6 +209,15 @@
 			case EXPOACT_OPEN:
 				scene_set_open(scn, act.select.id, true);
 				cedit_arange(exp, vid_priv, scene_id);
+				switch (scn->highlight_id) {
+				case EXPOID_SAVE:
+					done = true;
+					save = true;
+					break;
+				case EXPOID_DISCARD:
+					done = true;
+					break;
+				}
 				break;
 			case EXPOACT_CLOSE:
 				scene_set_open(scn, act.select.id, false);
@@ -229,6 +239,8 @@
 
 	if (ret)
 		return log_msg_ret("end", ret);
+	if (!save)
+		return -EACCES;
 
 	return 0;
 }
@@ -477,6 +489,9 @@
 	const char *str;
 	int val, ret;
 
+	if (obj->id < EXPOID_BASE_ID)
+		return 0;
+
 	snprintf(var, sizeof(var), "c.%s", obj->name);
 
 	switch (obj->type) {
@@ -549,6 +564,9 @@
 	char var[60];
 	int val;
 
+	if (obj->id < EXPOID_BASE_ID)
+		return 0;
+
 	snprintf(var, sizeof(var), "c.%s", obj->name);
 
 	switch (obj->type) {
@@ -644,7 +662,7 @@
 	int val, ret;
 	uint i, seq;
 
-	if (obj->type != SCENEOBJT_MENU)
+	if (obj->type != SCENEOBJT_MENU || obj->id < EXPOID_BASE_ID)
 		return 0;
 
 	menu = (struct scene_obj_menu *)obj;
@@ -734,7 +752,7 @@
 	int val, ret;
 	uint i;
 
-	if (obj->type != SCENEOBJT_MENU)
+	if (obj->type != SCENEOBJT_MENU || obj->id < EXPOID_BASE_ID)
 		return 0;
 
 	menu = (struct scene_obj_menu *)obj;
diff --git a/boot/expo.c b/boot/expo.c
index 700786e..786f665 100644
--- a/boot/expo.c
+++ b/boot/expo.c
@@ -29,7 +29,7 @@
 	exp->priv = priv;
 	INIT_LIST_HEAD(&exp->scene_head);
 	INIT_LIST_HEAD(&exp->str_head);
-	exp->next_id = 1;
+	exp->next_id = EXPOID_BASE_ID;
 
 	*expp = exp;
 
diff --git a/doc/develop/cedit.rst b/doc/develop/cedit.rst
index 82305b9..310be88 100644
--- a/doc/develop/cedit.rst
+++ b/doc/develop/cedit.rst
@@ -94,7 +94,7 @@
 enum::
 
     enum {
-        ZERO,
+        ID_PROMPT = EXPOID_BASE_ID,
 
         ID_PROMPT,
 
@@ -130,6 +130,11 @@
 in the `.dts` file that is not mentioned in your enum. Check both files and try
 again.
 
+Note that the first ID in your file must be no less that `EXPOID_BASE_ID` since
+IDs before that are reserved. The `expo.py` tool automatically obtains this
+value from the `expo.h` header file, but you must set the first ID to this
+enum value.
+
 
 Use the command interface
 -------------------------
diff --git a/doc/develop/expo.rst b/doc/develop/expo.rst
index f7b636e..d8115c4 100644
--- a/doc/develop/expo.rst
+++ b/doc/develop/expo.rst
@@ -88,8 +88,13 @@
 handled by allocating space in the enum for a maximum number of items, then
 adding the loop count to the enum values to obtain unique IDs.
 
-Where dynamic IDs are need, use expo_set_dynamic_start() to set the start value,
-so that they are allocated above the starting (enum) IDs.
+Some standard IDs are reserved for certain purposes. These are defined by
+`enum expo_id_t` and start at 1. `EXPOID_BASE_ID` defines the first ID which
+can be used for an expo.
+
+An ID of 0 is invalid. If this is specified in an expo call then a valid
+'dynamic IDs is allocated. Use expo_set_dynamic_start() to set the start
+value, so that they are allocated above the starting (enum) IDs.
 
 All text strings are stored in a structure attached to the expo, referenced by
 a text ID. This makes it easier at some point to implement multiple languages or
@@ -417,8 +422,7 @@
     /* this comment is parsed by the expo.py tool to insert the values below
 
     enum {
-        ZERO,
-        ID_PROMPT,
+        ID_PROMPT = EXPOID_BASE_ID,
         ID_SCENE1,
         ID_SCENE1_TITLE,
 
diff --git a/include/expo.h b/include/expo.h
index 50e11cd..d6e2cce 100644
--- a/include/expo.h
+++ b/include/expo.h
@@ -16,6 +16,26 @@
 #include <cli.h>
 
 /**
+ * enum expo_id_t - standard expo IDs
+ *
+ * These are assumed to be in use at all times. Expos should use IDs starting
+ * from EXPOID_BASE_ID,
+ *
+ * @EXPOID_NONE: Not used, invalid ID 0
+ * @EXPOID_SAVE: User has requested that the expo data be saved
+ * @EXPOID_DISCARD: User has requested that the expo data be discarded
+ * @EXPOID_BASE_ID: First ID which can be used for expo objects
+ */
+enum expo_id_t {
+	EXPOID_NONE,
+
+	EXPOID_SAVE,
+	EXPOID_DISCARD,
+
+	EXPOID_BASE_ID = 5,
+};
+
+/**
  * enum expoact_type - types of actions reported by the expo
  *
  * @EXPOACT_NONE: no action
diff --git a/include/test/cedit-test.h b/include/test/cedit-test.h
index 475ecc9..0d38a95 100644
--- a/include/test/cedit-test.h
+++ b/include/test/cedit-test.h
@@ -9,24 +9,24 @@
 #ifndef __cedit_test_h
 #define __cedit_test_h
 
-#define ID_PROMPT		1
-#define ID_SCENE1		2
-#define ID_SCENE1_TITLE		3
+#define ID_PROMPT		5
+#define ID_SCENE1		6
+#define ID_SCENE1_TITLE		7
 
-#define ID_CPU_SPEED		4
-#define ID_CPU_SPEED_TITLE	5
-#define ID_CPU_SPEED_1		6
-#define ID_CPU_SPEED_2		7
-#define ID_CPU_SPEED_3		8
+#define ID_CPU_SPEED		8
+#define ID_CPU_SPEED_TITLE	9
+#define ID_CPU_SPEED_1		10
+#define ID_CPU_SPEED_2		11
+#define ID_CPU_SPEED_3		12
 
-#define ID_POWER_LOSS		9
-#define ID_AC_OFF		10
-#define ID_AC_ON		11
-#define ID_AC_MEMORY		12
+#define ID_POWER_LOSS		13
+#define ID_AC_OFF		14
+#define ID_AC_ON		15
+#define ID_AC_MEMORY		16
 
-#define ID_MACHINE_NAME		13
-#define ID_MACHINE_NAME_EDIT	14
+#define ID_MACHINE_NAME		17
+#define ID_MACHINE_NAME_EDIT	18
 
-#define ID_DYNAMIC_START	15
+#define ID_DYNAMIC_START	19
 
 #endif
diff --git a/test/boot/cedit.c b/test/boot/cedit.c
index 1f7af8e..0f2c2e7 100644
--- a/test/boot/cedit.c
+++ b/test/boot/cedit.c
@@ -31,9 +31,11 @@
 	 * ^N  Move down to second item
 	 * ^M  Select item
 	 * \e  Quit
+	 *
+	 * cedit_run() returns -EACCESS so this command returns CMD_RET_FAILURE
 	 */
 	console_in_puts("\x0e\x0d\x0e\x0d\e");
-	ut_assertok(run_command("cedit run", 0));
+	ut_asserteq(1, run_command("cedit run", 0));
 
 	exp = cur_exp;
 	scn = expo_lookup_scene_id(exp, exp->scene_id);
@@ -147,14 +149,14 @@
 	strcpy(str, "my-machine");
 
 	ut_assertok(run_command("cedit write_env -v", 0));
-	ut_assert_nextlinen("c.cpu-speed=7");
+	ut_assert_nextlinen("c.cpu-speed=11");
 	ut_assert_nextlinen("c.cpu-speed-str=2.5 GHz");
-	ut_assert_nextlinen("c.power-loss=10");
+	ut_assert_nextlinen("c.power-loss=14");
 	ut_assert_nextlinen("c.power-loss-str=Always Off");
 	ut_assert_nextlinen("c.machine-name=my-machine");
 	ut_assert_console_end();
 
-	ut_asserteq(7, env_get_ulong("c.cpu-speed", 10, 0));
+	ut_asserteq(11, env_get_ulong("c.cpu-speed", 10, 0));
 	ut_asserteq_str("2.5 GHz", env_get("c.cpu-speed-str"));
 	ut_asserteq_str("my-machine", env_get("c.machine-name"));
 
@@ -163,8 +165,8 @@
 	*str = '\0';
 
 	ut_assertok(run_command("cedit read_env -v", 0));
-	ut_assert_nextlinen("c.cpu-speed=7");
-	ut_assert_nextlinen("c.power-loss=10");
+	ut_assert_nextlinen("c.cpu-speed=11");
+	ut_assert_nextlinen("c.power-loss=14");
 	ut_assert_nextlinen("c.machine-name=my-machine");
 	ut_assert_console_end();
 
diff --git a/test/boot/expo.c b/test/boot/expo.c
index f6a6b4f..b0bf298 100644
--- a/test/boot/expo.c
+++ b/test/boot/expo.c
@@ -91,7 +91,7 @@
 	*name = '\0';
 	ut_assertnonnull(exp);
 	ut_asserteq(0, exp->scene_id);
-	ut_asserteq(1, exp->next_id);
+	ut_asserteq(EXPOID_BASE_ID, exp->next_id);
 
 	/* Make sure the name was allocated */
 	ut_assertnonnull(exp->name);
@@ -130,7 +130,7 @@
 	ut_assertok(expo_new(EXPO_NAME, NULL, &exp));
 
 	scn = NULL;
-	ut_asserteq(1, exp->next_id);
+	ut_asserteq(EXPOID_BASE_ID, exp->next_id);
 	strcpy(name, SCENE_NAME1);
 	id = scene_new(exp, name, SCENE1, &scn);
 	*name = '\0';
@@ -176,11 +176,11 @@
 	int id;
 
 	ut_assertok(expo_new(EXPO_NAME, NULL, &exp));
-	ut_asserteq(1, exp->next_id);
+	ut_asserteq(EXPOID_BASE_ID, exp->next_id);
 
 	strcpy(name, SCENE_NAME1);
 	id = scene_new(exp, SCENE_NAME1, 0, &scn);
-	ut_asserteq(1, scn->id);
+	ut_asserteq(EXPOID_BASE_ID, scn->id);
 
 	return 0;
 }
diff --git a/test/boot/files/expo_ids.h b/test/boot/files/expo_ids.h
index a86e0d0..ffb5113 100644
--- a/test/boot/files/expo_ids.h
+++ b/test/boot/files/expo_ids.h
@@ -4,8 +4,7 @@
  */
 
 enum {
-	ZERO,
-	ID_PROMPT,
+	ID_PROMPT = EXPOID_BASE_ID,
 
 	ID_SCENE1,
 	ID_SCENE1_TITLE,
diff --git a/tools/expo.py b/tools/expo.py
index ea80c70..44995f2 100755
--- a/tools/expo.py
+++ b/tools/expo.py
@@ -20,17 +20,22 @@
 
 # Parse:
 #	SCENE1		= 7,
+# or    SCENE1		= EXPOID_BASE_ID,
 # or	SCENE2,
-RE_ENUM = re.compile(r'(\S*)(\s*= (\d))?,')
+RE_ENUM = re.compile(r'(\S*)(\s*= ([0-9A-Z_]+))?,')
 
 # Parse #define <name>  "string"
 RE_DEF = re.compile(r'#define (\S*)\s*"(.*)"')
 
-def calc_ids(fname):
+# Parse EXPOID_BASE_ID = 5,
+RE_BASE_ID = re.compile(r'\s*EXPOID_BASE_ID\s*= (\d+),')
+
+def calc_ids(fname, base_id):
     """Figure out the value of the enums in a C file
 
     Args:
         fname (str): Filename to parse
+        base_id (int): Base ID (value of EXPOID_BASE_ID)
 
     Returns:
         OrderedDict():
@@ -55,8 +60,12 @@
                 if not line or line.startswith('/*'):
                     continue
                 m_enum = RE_ENUM.match(line)
-                if m_enum.group(3):
-                    cur_id = int(m_enum.group(3))
+                enum_name = m_enum.group(3)
+                if enum_name:
+                    if enum_name == 'EXPOID_BASE_ID':
+                        cur_id = base_id
+                    else:
+                        cur_id = int(enum_name)
                 vals[m_enum.group(1)] = cur_id
                 cur_id += 1
             else:
@@ -67,10 +76,24 @@
     return vals
 
 
+def find_base_id():
+    fname = 'include/expo.h'
+    base_id = None
+    with open(fname, 'r', encoding='utf-8') as inf:
+        for line in inf.readlines():
+            m_base_id = RE_BASE_ID.match(line)
+            if m_base_id:
+                base_id = int(m_base_id.group(1))
+    if base_id is None:
+        raise ValueError('EXPOID_BASE_ID not found in expo.h')
+    #print(f'EXPOID_BASE_ID={base_id}')
+    return base_id
+
 def run_expo(args):
     """Run the expo program"""
+    base_id = find_base_id()
     fname = args.enum_fname or args.layout
-    ids = calc_ids(fname)
+    ids = calc_ids(fname, base_id)
     if not ids:
         print(f"Warning: No enum ID values found in file '{fname}'")