Committed a more or less working version.
diff --git a/Mac/Lib/test/twin.py b/Mac/Lib/test/twin.py
new file mode 100644
index 0000000..0904d32
--- /dev/null
+++ b/Mac/Lib/test/twin.py
@@ -0,0 +1,9 @@
+# Test Win module
+
+from Win import *
+
+r = (40, 40, 400, 300)
+w = NewWindow(r, "Hello world", 1, 0, -1, 1, 0x55555555)
+w.DrawGrowIcon()
+import time
+time.sleep(10)