Initial import

.gitignore

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+.vs/
+*.swp
+*.swo
+*.obj
+*.exe

build_cl.cmd

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+@set CC=cl
+@set CFLAGS=/nologo /O1
+@set LDFLAGS=/nodefaultlib /subsystem:windows /entry:WinMainCRTStartup
+@set LDLIBS=kernel32.lib user32.lib
+@set TARGET=closeall.exe
+
+%CC% %CFLAGS% /Fe:%TARGET% *.c /link %LDFLAGS% %LDLIBS%

build_gcc.cmd

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+@echo off
+
+set CC=gcc
+set CFLAGS=-ansi -Wall -nostdlib -ffreestanding -Os -s
+set LDFLAGS=-mwindows -s
+set LDLIBS=-lkernel32 -luser32
+set TARGET=closeall.exe
+
+%CC% %CFLAGS% %LDFLAGS% -o %TARGET% *.c %LDLIBS%

closeall.c

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+#include <windows.h>
+
+static BOOL CALLBACK EnumProc(HWND hwnd, LPARAM lParam)
+{
+	if ((GetWindowLong(hwnd, GWL_STYLE) &
+			(WS_VISIBLE|WS_OVERLAPPEDWINDOW|WS_CHILD)) ==
+			(WS_VISIBLE|WS_OVERLAPPEDWINDOW))
+		PostMessage(hwnd, WM_CLOSE, 0, 0);
+
+	return TRUE;
+}
+
+void WinMainCRTStartup(void)
+{
+	EnumWindows(EnumProc, 0);
+	ExitProcess(0);
+}