diff --git a/programs/Windows.kl b/programs/Windows.kl
index 31de501..5e61067 100644
--- a/programs/Windows.kl
+++ b/programs/Windows.kl
@@ -1,5 +1,6 @@
 DWORD :: U32
 LPCSTR :: *char
+LPSTR :: *char
 LPCWSTR :: *U16
 HWND :: *void
 HMENU :: *void
@@ -22,6 +23,7 @@ BYTE :: U8 // @todo? unsigned char
 WORD :: S16 // short
 LONG :: S32 // @todo long
 UINT :: U32 // @todo uint
+ATOM :: WORD
 
 MEM_COMMIT :: 0x00001000
 MEM_RESERVE :: 0x00002000
diff --git a/programs/main.kl b/programs/main.kl
index 0450895..20178e6 100644
--- a/programs/main.kl
+++ b/programs/main.kl
@@ -131,21 +131,20 @@ create_bitmap :: (size: Vec2I, bottom_up: Bool = true): Windows_Bitmap
   result.hdc = CreateCompatibleDC(hdc)
   return result
 
+app_is_running := true
 window_procedure :: (hwnd: HWND, msg: UINT, wparam: WPARAM, lparam: LPARAM): LRESULT
   if msg == WM_DESTROY
     PostQuitMessage(0)
     return 0
   else;; return DefWindowProcW(hwnd, msg, wparam, lparam)
 
-main :: (argc: int, argv: **char): int
-  bitmap := create_bitmap({1280, 720})
-
+test_unicode :: ()
   string := "    豈 更 車 賈 滑 串 句 龜 龜 契 金 喇 奈 懶 癩 羅 蘿 螺 裸 邏 樂 洛 烙 珞 落 酪 駱 亂 卵 欄 爛 蘭 鸞 嵐 濫 藍 襤 拉 臘 蠟 廊 朗 浪 狼 郎 來 冷 勞 擄 櫓 爐 盧 老 蘆 虜 路 露 魯 鷺 碌 祿 綠 菉 錄 鹿 論 壟 弄 籠 聾 牢 磊 賂 雷 壘 屢 樓 淚 漏 累 縷 陋 勒 肋 凜 凌 稜 綾 菱 陵 讀 拏 樂 諾 丹 寧 怒 率 異 北 磻 便 復 不 泌 數 索 參 塞 省 葉 說 殺 辰 沈 拾 若 掠 略 亮 兩 凉 梁 糧 良 諒 量 勵 ..."
   string_result := string_to_string16(string)
   print(string_result)
 
   result := utf8_to_utf32(&"A"[0], 1)
-  assert(result.out_str == 'A, "Invalid decode")
+  assert(result.out_str == 'A, "Invalid decode") // '
 
   result  = utf8_to_utf32(&"ć"[0], 2)
   assert(result.out_str == 0x107, "Invalid decode")
@@ -153,3 +152,31 @@ main :: (argc: int, argv: **char): int
   result  = utf8_to_utf32(&"ó"[0], 2)
   assert(result.out_str == 0xF3, "Invalid decode")
 
+WinMain :: (hInstance: HINSTANCE, hPrevInstance: HINSTANCE, lpCmdLine: LPSTR, nShowCmd: int): int
+  bitmap := create_bitmap({1280, 720})
+
+  window_name := string_to_string16("Have a wonderful day!")
+  w := WNDCLASSW{
+    lpfnWndProc   = window_procedure,
+    hInstance     = hInstance,
+    lpszClassName = window_name.str,
+  }
+  assert(RegisterClassW(&w) != 0)
+
+  window := CreateWindowExW(
+    dwExStyle = 0, hWndParent = 0, hMenu = 0, lpParam = 0,
+    X = CW_USEDEFAULT, Y = CW_USEDEFAULT, nWidth = CW_USEDEFAULT, nHeight = CW_USEDEFAULT,
+    lpClassName = window_name.str,
+    lpWindowName = window_name.str,
+    dwStyle = WS_OVERLAPPEDWINDOW,
+    hInstance = hInstance
+  )
+  assert(window != 0)
+  ShowWindow(window, nShowCmd)
+
+  for app_is_running
+    msg: MSG
+    for PeekMessageW(&msg, window, 0, 0, PM_REMOVE) > 0
+      TranslateMessage(&msg)
+      DispatchMessageW(&msg)
+
diff --git a/programs/user32.kl b/programs/user32.kl
index e1649ad..7c5ad20 100644
--- a/programs/user32.kl
+++ b/programs/user32.kl
@@ -1,13 +1,53 @@
 #load "Windows.kl"
-WNDPROC :: (hwnd: HWND, uMsg: UINT, wParam: WPARAM, lParam: LPARAM): LRESULT
-WNDCLASSW :: struct;; style: UINT; lpfnWndProc: WNDPROC; cbClsExtra: int; cbWndExtra: int; hInstance: HINSTANCE; hIcon: HICON; hCursor: HCURSOR; hbrBackground: HBRUSH; lpszMenuName: LPCWSTR; lpszClassName: LPCWSTR
+WNDPROC         :: (hwnd: HWND, uMsg: UINT, wParam: WPARAM, lParam: LPARAM): LRESULT
+WNDCLASSW       :: struct;; style: UINT; lpfnWndProc: WNDPROC; cbClsExtra: int; cbWndExtra: int; hInstance: HINSTANCE; hIcon: HICON; hCursor: HCURSOR; hbrBackground: HBRUSH; lpszMenuName: LPCWSTR; lpszClassName: LPCWSTR
+MSG             :: struct;; hwnd: HWND; message: UINT; wParam: WPARAM; lParam: LPARAM; time: DWORD; pt: POINT; lPrivate: DWORD
+POINT           :: struct;; x: LONG; y: LONG
+LPMSG           :: *MSG
+
+PostQuitMessage :: #foreign (nExitCode: int)
+DefWindowProcW  :: #foreign (hwnd: HWND, uMsg: UINT, wParam: WPARAM, lParam: LPARAM): LRESULT
+GetDC           :: #foreign (hWnd: HWND): HDC
+CreateWindowA   :: #foreign (dwExStyle: DWORD, lpClassName: *char, lpWindowName: *char, dwStyle: DWORD, X: int, Y: int, nWidth: int, nHeight: int, hWndParent: HWND, hMenu: HMENU, hInstance: HINSTANCE, lpParam: *void): HWND
+CreateWindowExW :: #foreign (dwExStyle: DWORD, lpClassName: LPCWSTR, lpWindowName: LPCWSTR, dwStyle: DWORD, X: int, Y: int, nWidth: int, nHeight: int, hWndParent: HWND, hMenu: HMENU, hInstance: HINSTANCE, lpParam: LPVOID): HWND
+RegisterClassW  :: #foreign (lpWndClass: *WNDCLASSW): ATOM
+ShowWindow      :: #foreign (hWnd: HWND, nCmdShow: int): BOOL
+PeekMessageW    :: #foreign (lpMsg: LPMSG, hWnd: HWND, wMsgFilterMin: UINT, wMsgFilterMax: UINT, wRemoveMs: UINT):BOOL
+TranslateMessage:: #foreign (lpMsg: *MSG): BOOL
+DispatchMessageW:: #foreign (lpMsg: *MSG): LRESULT
 
-PostQuitMessage :: #foreign(nExitCode: int)
-DefWindowProcW :: #foreign (hwnd: HWND, uMsg: UINT, wParam: WPARAM, lParam: LPARAM): LRESULT
-GetDC :: #foreign (hWnd: HWND): HDC
-CreateWindowA :: #foreign (dwExStyle: DWORD, lpClassName: *char, lpWindowName: *char, dwStyle: DWORD, X: int, Y: int, nWidth: int, nHeight: int, hWndParent: HWND, hMenu: HMENU, hInstance: HINSTANCE, lpParam: *void): HWND
-CreateWindowExW :: #foreign (dwExStyle: DWORD, lpClassName: LPCWSTR, lpWindowName: LPCWSTR, dwStyle: DWORD, X: int, Y: int, nWidth: int, nHeight: int, hWndParent: HWND, hMenu: HMENU, hInstance: HINSTANCE, lpPara: LPVOID): HWND
 
 WM_NULL :: 0x0000; WM_CREATE :: 0x0001; WM_DESTROY :: 0x0002; WM_MOVE :: 0x0003; WM_SIZE :: 0x0005
 WM_ACTIVATE :: 0x0006; WA_INACTIVE :: 0; WA_ACTIVE :: 1; WA_CLICKACTIVE :: 2
-WM_SETFOCUS :: 0x0007; WM_KILLFOCUS :: 0x0008; WM_ENABLE :: 0x000A; WM_SETREDRAW :: 0x000B; WM_SETTEXT :: 0x000C; WM_GETTEXT :: 0x000D; WM_GETTEXTLENGTH :: 0x000E; WM_PAINT :: 0x000F; WM_CLOSE :: 0x0010
\ No newline at end of file
+WM_SETFOCUS :: 0x0007; WM_KILLFOCUS :: 0x0008; WM_ENABLE :: 0x000A; WM_SETREDRAW :: 0x000B; WM_SETTEXT :: 0x000C; WM_GETTEXT :: 0x000D; WM_GETTEXTLENGTH :: 0x000E; WM_PAINT :: 0x000F; WM_CLOSE :: 0x0010
+CW_USEDEFAULT :: -2147483648//0x80000000
+
+WS_BORDER           :: 0x00800000
+WS_CAPTION          :: 0x00C00000
+WS_CHILD            :: 0x40000000
+WS_CHILDWINDOW      :: 0x40000000
+WS_CLIPCHILDREN     :: 0x02000000
+WS_CLIPSIBLINGS     :: 0x04000000
+WS_DISABLED         :: 0x08000000
+WS_DLGFRAME         :: 0x00400000
+WS_GROUP            :: 0x00020000
+WS_HSCROLL          :: 0x00100000
+WS_ICONIC           :: 0x20000000
+WS_MAXIMIZE         :: 0x01000000
+WS_MAXIMIZEBOX      :: 0x00010000
+WS_MINIMIZE         :: 0x20000000
+WS_MINIMIZEBOX      :: 0x00020000
+WS_OVERLAPPED       :: 0x00000000
+WS_POPUP            :: 0x80000000
+WS_SIZEBOX          :: 0x00040000
+WS_SYSMENU          :: 0x00080000
+WS_TABSTOP          :: 0x00010000
+WS_THICKFRAME       :: 0x00040000
+WS_TILED            :: 0x00000000
+WS_VISIBLE          :: 0x10000000
+WS_VSCROLL          :: 0x00200000
+WS_OVERLAPPEDWINDOW :: WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX
+
+PM_NOREMOVE :: 0
+PM_REMOVE :: 0x0001
+PM_NOYIELD :: 0x0002
\ No newline at end of file