diff --git a/win/ahk/Spotlight.ahk b/win/ahk/Spotlight.ahk
index c7c4bd7..d5abf92 100644
--- a/win/ahk/Spotlight.ahk
+++ b/win/ahk/Spotlight.ahk
@@ -2,14 +2,13 @@
 Spotlight() {
     global
 
-    SPOTLIGHT_ITEMS := 10
-    SPOTLIGHT_FONT_NAME := "Sarasa Mono SC Nerd"
+    SPOTLIGHT_FONT_NAME := "Sarasa Mono SC"
     SPOTLIGHT_ITEM_FONT_STYLE := "s14 ceeeeee"
     SPOTLIGHT_SELECTED_ITEM_FONT_STYLE := "s14 c007acc"
 
-    spotlightSelectedIndex := 1
-    keyword := ""
-    windows := GetWindowList()
+    SPOTLIGHT_ITEMS := 10
+    SPOTLIGHT_SELECTED_INDEX := 1
+    SPOTLIGHT_SELECTED_ITEM := null
 
     ; window position
     GetCursorMonGeometry(x, y, w, h)
@@ -18,16 +17,16 @@ Spotlight() {
     wx := x + w / 2 - ww / 2
     wy := y + h / 2 - wh / 2
 
-    Gui, New, +Theme -Border +AlwaysOnTop, Spotlight
+    Gui, New, +Theme -Border +AlwaysOnTop -0xc00000, Spotlight
     Gui, Font, %SPOTLIGHT_ITEM_FONT_STYLE%, %SPOTLIGHT_FONT_NAME%
     Gui, Color, 252526
 
     ; search box
-    keywordX := 10
-    keywordY := 10
-    keywordW := ww - 20
-    keywordH := 30
-    Gui, Add, Edit, x%keywordX% y%keywordY% w%keywordW% h%keywordH% c252525 gOnChange vKeywordEdit
+    userInputX := 10
+    userInputY := 10
+    userInputW := ww - 20
+    userInputH := 30
+    Gui, Add, Edit, x%userInputX% y%userInputY% w%userInputW% h%userInputH% c252525 gOnChange vUserInputEdit
 
     ; ok button
     Gui, Add, Button, Default Hidden gOnEnter, Ok
@@ -35,27 +34,24 @@ Spotlight() {
     ; result items
     Loop %SPOTLIGHT_ITEMS% {
         ItemEdit%A_Index% := null
-        Gui, Add, Text, w%keywordW% vItemEdit%A_Index%
+        Gui, Add, Text, w%userInputW% vItemEdit%A_Index%
     }
 
-    ; load windows
-    FilterWindowList()
+    ; parse keyword
+    SpotlightProcessUserInput()
 
     ; show window on center
     Gui, Show, X %wx% Y %wy% W %ww% H %wh%
-    spotlightSelectedIndex := spotlightSelectedIndex + 1
-    FilterWindowList()
-
     Return
 
     OnChange:
-        GuiControlGet, keyword, , KeywordEdit
-        FilterWindowList()
+        local userInput := ""
+        GuiControlGet, userInput, , UserInputEdit
+        SpotlightProcessUserInput(userInput)
     Return
 
     OnEnter:
-        WinActivate, ahk_id %spotlightSelectedWindowId%
-        SetCursorToCenterOfActiveWin()
+        SpotlightProcessUserInput(userInput, 1)
         Gui, Destroy
     Return
 
@@ -64,55 +60,118 @@ Spotlight() {
     Return
 }
 
-FilterWindowList() {
-    global
-    local index := 1
+SpotlightProcessUserInput(userInput := "", stage := 0) {
+    global SPOTLIGHT_SELECTED_INDEX := 1
+    mode := ""
+    idx := 0
 
-    kw := keyword
-    sl := 1
-    idx := RegExMatch(keyword, " \d")
+    ; extract "<mode-sign> " as mode, current only '>' as command mode
+    idx := RegExMatch(userInput, ">")
     if (idx) {
-        kw := SubStr(keyword, 1, idx-1)
-        sl := SubStr(keyword, idx+1)
+        mode := SubStr(userInput, 1, 1)
+        userInput := SubStr(userInput, 2)
     }
-    LogDebug("keyword {1}, selected {2}", kw, sl)
-    for winIndex, win in windows {
-        name := win[1]
-        id := win[2]
-        if (name and InStr(name, kw)) {
-            suffix := ""
-            if (sl = index) {
-                Gui, Font, %SPOTLIGHT_SELECTED_ITEM_FONT_STYLE%, %SPOTLIGHT_FONT_NAME%
-                spotlightSelectedWindowId := id
-                suffix := " <<< "
-            } else {
-                Gui, Font, %SPOTLIGHT_ITEM_FONT_STYLE%, %SPOTLIGHT_FONT_NAME%
-            }
-            name := Format("{1} {2} {3}", index, name, suffix)
-            GuiControl, Font, ItemEdit%index%
-            GuiControl, , ItemEdit%index%, %name%
-            index := index + 1
-        }
+
+    ; extract " <number>" as selected index
+    idx := RegExMatch(userInput, " \d")
+    if (idx) {
+        SPOTLIGHT_SELECTED_INDEX := SubStr(userInput, idx+1)
+        userInput := SubStr(userInput, 1, idx-1)
     }
-    While index < SPOTLIGHT_ITEMS {
-        GuiControl, , ItemEdit%index%
-        index := index + 1
+
+    LogDebug("SPOTLIGHT >>> mode {1} input {2} stage {3}", mode, userInput, stage)
+    ; enter mode subroutine
+    if (mode = ">") {
+        SpotlightRunCommand(userInput, stage)
+    } else {
+        SpotlightSwitchWindow(userInput, stage)
     }
 }
 
-GetWindowList() {
+SpotlightUpdateItems(items) {
+    global
+    LogDebug("SPOTLIGHT >>> update ui items, count {1}, first text {2}", items.Length(), items[1][1])
+
+    ; make sure items within limit
+    while (items.Length() > SPOTLIGHT_ITEMS) {
+        items.Pop()
+    }
+    ; update first n lines
+    for itemIndex, item in items {
+        itemText := item[1]
+        if (itemIndex = SPOTLIGHT_SELECTED_INDEX) {
+            Gui, Font, %SPOTLIGHT_SELECTED_ITEM_FONT_STYLE%, %SPOTLIGHT_FONT_NAME%
+            itemText := itemText . " <<< "
+            SPOTLIGHT_SELECTED_ITEM := item
+        } else {
+            Gui, Font, %SPOTLIGHT_ITEM_FONT_STYLE%, %SPOTLIGHT_FONT_NAME%
+        }
+        lineText := Format("{1} {2}", itemIndex, itemText)
+        LogDebug("SPOTLIGHT >>> line {1}", lineText)
+        GuiControl, Font, ItemEdit%itemIndex%
+        GuiControl, , ItemEdit%itemIndex%, %lineText%
+    }
+    ; clear contents of rest lines
+    While itemIndex <= SPOTLIGHT_ITEMS {
+        itemIndex := itemIndex + 1
+        GuiControl, , ItemEdit%itemIndex%
+    }
+}
+
+SpotlightRunCommand(command, stage) {
+    funcName := Format("cmd_{1}", command)
+    if (IsFunc(funcName)) {
+        %funcName%()
+    }
+}
+
+SpotlightSwitchWindow(keyword, stage) {
+    global SPOTLIGHT_SELECTED_ITEM
+    LogDebug("SPOTLIGHT >>> switch window mode, keyword {1}, stage {2}", keyword, stage)
+    if (stage = 1) {
+        winId := SPOTLIGHT_SELECTED_ITEM[2]
+        LogDebug("SPOTLIGHT >>> switch to window {1} item length {2}", winId, SPOTLIGHT_SELECTED_ITEM.Length())
+        WinActivate, ahk_id %winId%
+        SetCursorToCenterOfActiveWin()
+        return
+    }
+
+    items := Array()
     WinGet windows, List
-    wins := Array()
-    LogDebug("A_Gui: {1}", A_Gui)
     Loop %windows% {
-        id := windows%A_Index%
-        WinGetTitle wt, ahk_id %id%
-        if (id = A_Gui or !wt) {
+        winId := windows%A_Index%
+        if (A_DefaultGui = winId) {
+            LogDebug("SPOTLIGHT >>> skip default gui: {2}", winId, A_DefaultGui)
             Continue
         }
-        WinGet wp, ProcessName, ahk_id %id%
-        name := Format("{1:-20} {2}", wp, wt)
-        wins.Push(Array(name, id))
+        WinGetTitle winTitle, ahk_id %winId%
+        if (!winTitle) {
+            Continue
+        }
+        WinGet procName, ProcessName, ahk_id %winId%
+        itemText := Format("{1:-20} {2}", procName, winTitle)
+        if (itemText and !InStr(itemText, keyword)) {
+            Continue
+        }
+        items.Push(Array(itemText, winId))
     }
-    return wins
+    SpotlightUpdateItems(items)
+}
+
+cmd_wt() {
+    TIMEZONES := { "Atlantic": -3 }
+
+
+        ; dt := A_NowUTC
+        ; dt += -3, Hours
+        ; FormatTime, timeText, %A_Now%, dd HH:mm
+        ; LogDebug("SPOTLIGHT >>> now {1}", timeText)
+    items := Array()
+    for zone, offset in TIMEZONES {
+        dt = %A_NowUTC%
+        dt += offset, Hours
+        FormatTime, timeText, %dt%, dd HH:mm
+        items.Push(Array(Format("{1:-20} {2}", zone, timeText)))
+    }
+    SpotlightUpdateItems(items)
 }
\ No newline at end of file