diff --git a/gentoo.conf b/gentoo.conf
index 3ff4e43..e072f26 100644
--- a/gentoo.conf
+++ b/gentoo.conf
@@ -132,7 +132,7 @@ luks_getkeyfile() {
 # System configuration
 
 # Enter the desired system hostname here,
-# be aware that when creating raid arrays, this value will be
+# be aware that when creating mdadm raid arrays, this value will be
 # recorded in metadata block. If you change it later, you should
 # also update the metadata.
 HOSTNAME="gentoo"
diff --git a/menu.sh b/menu.sh
index e3769a7..88c7d86 100755
--- a/menu.sh
+++ b/menu.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -o pipefail
 
 ################################################
 # Script setup
@@ -10,7 +11,11 @@ echo "Please install dialog on your system to use the configurator"
 ################################################
 # Configuration storage
 
+UNSAVED_CHANGES=false
+SAVE_AS_FILENAME="gentoo.conf"
+
 HOSTNAME="gentoo"
+# TODO get from current system
 TIMEZONE="Europe/London"
 KEYMAP="us"
 KEYMAP_INITRAMFS="$KEYMAP"
@@ -35,31 +40,39 @@ INSTALL_SSHD=true
 ROOT_SSH_AUTHORIZED_KEYS=""
 
 
-I_HAVE_READ_AND_EDITED_THE_CONFIG_PROPERLY=false
-
-
 ################################################
-# Menu
+# Menu definition
 
-dialog_save() {
-	true
+MENU_ITEMS=(
+	"HOSTNAME"
+	"TIMEZONE"
+	"KEYMAP"
+	"LOCALE"
+	"INIT_SYSTEM"
+	"KEYFILE"
+)
+
+function HOSTNAME_tag()   { echo "Hostname"; }
+function HOSTNAME_label() { echo "($HOSTNAME)"; }
+function HOSTNAME_menu()  {
+	local sel
+	sel="$(dialog --clear \
+		--help-button --help-label "Menu" \
+		--ok-label "Next" --cancel-label "Exit" \
+		--extra-button --extra-label "Back" \
+		--title "Select hostname" \
+		--inputbox "Enter the hostname for your new system." \
+		8 72 "$HOSTNAME" 3>&2 2>&1 1>&3 3>&-)"
+	UNSAVED_CHANGES=true
 }
 
-dialog_cancel() {
-	# TODO really cancel and discard changes?
-	true
-}
+function TIMEZONE_tag()   { echo "Timezone"; }
+function TIMEZONE_label() { echo "($TIMEZONE)"; }
+function TIMEZONE_help()  { echo "ajajaejaejgj jagj etjghoajf iajgpiajroianer goinaeirogn oairg arga lnaorignap ojkjaprogj iarrgona og"; }
 
-dialog_intro() {
-	# TODO hi there, in the following configure.
-	true
-}
-
-dialog_hostname() {
-	HOSTNAME="$(dialog --clear --help-button --help-label "Menu" --ok-label "Next" --cancel-label "Exit" --extra-button --extra-label "Back" --title "Select hostname" --inputbox "Enter the hostname for your new system." 8 72 "$HOSTNAME" 3>&2 2>&1 1>&3 3>&-)"
-}
-
-dialog_keymap() {
+function KEYMAP_tag()   { echo "Keymap"; }
+function KEYMAP_label() { echo "($KEYMAP)"; }
+function KEYMAP_menu()  {
 	local items=()
 	local map
 	for map in $(find /usr/share/keymaps/ /usr/share/kbd/keymaps/ -type f -iname '*.map.gz' -printf "%f\n" 2>/dev/null | sort -u); do
@@ -70,82 +83,127 @@ dialog_keymap() {
 			items+=("${map}" "off")
 		fi
 	done
-	KEYMAP="$(dialog --clear --help-button --help-label "Menu" --ok-label "Next" --cancel-label "Exit" --extra-button --extra-label "Back" --noitem --title "Select keymap" --radiolist "Select which keymap to use in the vconsole." 16 72 8 "${items[@]}" 3>&2 2>&1 1>&3 3>&-)"
-	dialog --title "Not ok" --msgbox "not ok bro" 10 62
-	echo $? $KEYMAP
+
+	local sel
+	sel="$(dialog --clear \
+		--help-button --help-label "Menu" \
+		--ok-label "Next" --cancel-label "Exit" \
+		--extra-button --extra-label "Back" \
+		--noitem \
+		--title "Select keymap" \
+		--radiolist "Select which keymap to use in the vconsole." \
+		16 72 8 "${items[@]}" 3>&2 2>&1 1>&3 3>&-)"
 }
 
-#create_btrfs_raid_layout swap=8GiB luks=true /dev/sdX
-#luks_getkeyfile() {
-#	case "$1" in
-#		#'my_luks_partition') echo -n '/path/to/my_luks_partition_keyfile' ;;
-#		*) echo -n "/path/to/luks-keyfile" ;;
-#	esac
-#}
+function LOCALE_tag()   { echo "Locale"; }
+function LOCALE_label() { echo "($LOCALE)"; }
 
-#dialog_hostname
-#dialog_keymap
-echo
-echo $HOSTNAME
-echo $KEYMAP
+function INIT_SYSTEM_tag()   { echo "Init system"; }
+function INIT_SYSTEM_label() { echo "($INIT_SYSTEM)"; }
 
-MENU_ITEMS=(
-	"HOSTNAME"
-	"TIMEZONE"
-	"KEYMAP"
-	"LOCALE"
-	"INIT_SYSTEM"
-)
+function KEYFILE_tag()   { echo "Key file"; }
+function KEYFILE_label() { echo "($KEYFILE)"; }
 
-HOSTNAME_tag() {
-	echo "Hostname"
+
+################################################
+# Menu functions
+
+# $1: filename
+function save() {
+	echo save to "$1"
 }
 
-HOSTNAME_item() {
-	echo "($HOSTNAME)"
+function msgbox_help() {
+	dialog --clear \
+		--msgbox "$1" \
+		8 66 3>&2 2>&1 1>&3 3>&-
 }
 
-TIMEZONE_tag() {
-	echo "Timezone"
+function menu_exit() {
+	if [[ $UNSAVED_CHANGES == "true" ]]; then
+		local sel
+		sel="$(dialog --clear \
+			--help-button --help-label "Back" \
+			--yes-label "Save" --no-label "Discard" \
+			--yesno "Do you want to save your configuration?\n(Press <ESC><ESC>, or choose <Back> to continue gentoo configuration)." \
+			8 66 3>&2 2>&1 1>&3 3>&-)"
+
+		local diag_exit="$?"
+		if [[ $diag_exit == 0 ]]; then
+			# <Save>
+			save "gentoo.conf"
+			exit 0
+		elif [[ $diag_exit == 1 ]]; then
+			# <Discard>
+			exit 0
+		else
+			# Back to menu (<ESC><ESC>, <Back>)
+			true
+		fi
+	else
+		# Nothing was changed. Exit immediately.
+		exit 0
+	fi
 }
 
-TIMEZONE_item() {
-	echo "($TIMEZONE)"
+function menu_save_as() {
+	local sel
+	sel="$(dialog --clear \
+		--ok-label "Save" \
+		--inputbox "Enter a filename to which this configuration should be saved.\n(Press <ESC><ESC>, or choose <Cancel> to abort)." \
+		8 66 "$SAVE_AS_FILENAME" 3>&2 2>&1 1>&3 3>&-)"
+
+	local diag_exit="$?"
+	if [[ $diag_exit == 0 ]]; then
+		# <Save>
+		SAVE_AS_FILENAME="$sel"
+		save "$SAVE_AS_FILENAME"
+		UNSAVED_CHANGES=false
+	else
+		# Back to menu (<ESC><ESC>, <Cancel>)
+		true
+	fi
 }
 
-KEYMAP_tag() {
-	echo "Keymap"
-}
-
-KEYMAP_item() {
-	echo "($KEYMAP)"
-}
-
-LOCALE_tag() {
-	echo "Locale"
-}
-
-LOCALE_item() {
-	echo "($LOCALE)"
-}
-
-INIT_SYSTEM_tag() {
-	echo "Init system"
-}
-
-INIT_SYSTEM_item() {
-	echo "($INIT_SYSTEM)"
-}
-
-dialog_menu() {
+function menu() {
 	local item
+	local item_tag
 	local tag_item_list=()
+	declare -A reverse_lookup
+
+	# Create menu list
 	for item in "${MENU_ITEMS[@]}"; do
-		tag_item_list+=("$(${item}_tag)" "$(${item}_item)")
+		item_tag="$("${item}_tag")"
+		tag_item_list+=("$item_tag" "$("${item}_label")")
+		reverse_lookup["$item_tag"]="$item"
 	done
-	dialog --clear --title "Gentoo configuration" --ok-label "Select" --cancel-label "Exit" --menu "Main config menu" 16 72 8 "${tag_item_list[@]}"
-	# TODO double escape -> same as exit -> confirm dialog
+
+	local sel
+	sel="$(dialog --clear \
+		--title "Gentoo configuration" \
+		--extra-button --extra-label "Exit" \
+		--help-button \
+		--ok-label "Select" --cancel-label "Save" \
+		--menu "Main config menu" \
+		16 72 8 "${tag_item_list[@]}" 3>&2 2>&1 1>&3 3>&-)"
+
+	local diag_exit="$?"
+	if [[ $diag_exit == 0 ]]; then
+		# <Select>
+		"${reverse_lookup[$sel]}_menu"
+	elif [[ $diag_exit == 1 ]]; then
+		# <Save>
+		menu_save_as
+	elif [[ $diag_exit == 2 ]]; then
+		# <Help>
+		msgbox_help "$("${reverse_lookup[${sel#HELP }]}_help")"
+	else
+		# Exit (<ESC><ESC>, <Exit>)
+		menu_exit
+		true
+	fi
 }
 
-
-dialog_menu
+while true; do
+	menu
+done