gistfile1.txt

		[DllImport ("/System/Library/Frameworks/IOKit.framework/IOKit")]
		static extern uint IOServiceGetMatchingService(uint	masterPort, IntPtr matching );

		[DllImport ("/System/Library/Frameworks/IOKit.framework/IOKit")]
		static extern IntPtr IOServiceMatching (string s);

		[DllImport ("/System/Library/Frameworks/IOKit.framework/IOKit")]
		static extern IntPtr IORegistryEntryCreateCFProperty(uint entry, IntPtr key, IntPtr allocator, uint options);

		[DllImport ("/System/Library/Frameworks/IOKit.framework/IOKit")]
		static extern int IOObjectRelease(uint o);

		static string GetSerialNumber ()
		{
			string serial = string.Empty;
			uint platformExpert = IOServiceGetMatchingService (0, IOServiceMatching ("IOPlatformExpertDevice"));
			if (platformExpert != 0) {
				NSString key = (NSString)"IOPlatformSerialNumber";
				IntPtr serialNumber = IORegistryEntryCreateCFProperty (platformExpert, key.Handle, IntPtr.Zero, 0);
				if (serialNumber != IntPtr.Zero) {
					serial = new NSString (serialNumber);
				}
				IOObjectRelease (platformExpert);
			}

			return serial;
		}