diff --git a/app/CMakeLists.txt b/app/CMakeLists.txt
index d0f0dd8..1d44943 100644
--- a/app/CMakeLists.txt
+++ b/app/CMakeLists.txt
@@ -5,6 +5,9 @@
 
 cmake_minimum_required(VERSION 3.6.0)
 
+project("org.emulator.calculator.EmuApplication")
+
+
 #add_compile_options(-DDEBUG_DISPLAY)
 #add_compile_options(-DDEBUG_SOUND)
 #add_compile_options(-DDEBUG_DEBUGGER)
@@ -34,6 +37,16 @@ add_compile_options(-DEMUXX=48)
 #add_compile_options(-Wno-error=implicit-function-declaration)
 add_compile_options(-fpermissive)
 add_compile_options(-Wno-error=incompatible-pointer-types)
+add_compile_options(-Wno-absolute-value)
+add_compile_options(-Wno-ignored-pragmas)
+add_compile_options(-Wno-incompatible-pointer-types)
+add_compile_options(-Wno-int-conversion)
+add_compile_options(-Wno-nonportable-include-path)
+add_compile_options(-Wno-pointer-bool-conversion)
+add_compile_options(-Wno-pointer-integer-compare)
+add_compile_options(-Wno-pointer-sign)
+add_compile_options(-Wno-return-type)
+add_compile_options(-Wno-unsequenced)
 
 if(CMAKE_BUILD_TYPE STREQUAL Release)
 	message("RELEASE BUILD")
@@ -57,7 +70,7 @@ add_library( # Sets the name of the library.
 
         src/main/cpp/core/apple.c
 #        src/main/cpp/core/cursor.c
-#        src/main/cpp/core/ddeserv.c
+        src/main/cpp/core/ddeserv.c
 #        src/main/cpp/core/debugger.c
         src/main/cpp/core/disasm.c
         src/main/cpp/core/dismem.c
diff --git a/app/src/main/cpp/android-emu.c b/app/src/main/cpp/android-emu.c
index a11897a..f2e383c 100644
--- a/app/src/main/cpp/android-emu.c
+++ b/app/src/main/cpp/android-emu.c
@@ -20,6 +20,8 @@
 #include "core/debugger.h"
 #include "win32-layer.h"
 
+LPTSTR szAppName = _T("Emu48");				// application name for DDE server
+LPTSTR szTopic   = _T("Stack");				// topic for DDE server
 LPTSTR szTitle   = NULL;
 
 CRITICAL_SECTION csGDILock;					// critical section for hWindowDC
@@ -36,6 +38,8 @@ INT              nArgc;						// no. of command line arguments
 LPCTSTR          *ppArgv;					// command line arguments
 LARGE_INTEGER    lFreq;						// high performance counter frequency
 LARGE_INTEGER    lAppStart;					// high performance counter value at Appl. start
+DWORD            idDdeInst;					// DDE server id
+UINT             uCF_HpObj;					// DDE clipboard format
 HANDLE           hThread;
 HANDLE           hEventShutdn;				// event handle to stop cpu thread
 
diff --git a/app/src/main/cpp/emu-jni.c b/app/src/main/cpp/emu-jni.c
index cfad6b5..2e8563c 100644
--- a/app/src/main/cpp/emu-jni.c
+++ b/app/src/main/cpp/emu-jni.c
@@ -501,7 +501,28 @@ JNIEXPORT void JNICALL Java_org_emulator_calculator_NativeLib_start(JNIEnv *env,
         return;
     }
 
-    soundEnabled = soundAvailable = SoundOpen(uWaveDevId);					// open waveform-audio output device
+	idDdeInst = 0;							// initialize DDE server
+	if (DdeInitialize(&idDdeInst,(PFNCALLBACK) &DdeCallback,
+	                  APPCLASS_STANDARD |
+	                  CBF_FAIL_EXECUTES | CBF_FAIL_ADVISES |
+	                  CBF_SKIP_REGISTRATIONS | CBF_SKIP_UNREGISTRATIONS,0))
+	{
+		// TerminateThread(hThread, 0);		// kill emulation thread
+		CloseHandle(hEventShutdn);			// close event handle
+		AbortMessage(_T("Could not initialize server!"));
+		//DestroyWindow(hWnd);
+		return; // FALSE;
+	}
+
+	// init clipboard format and name service
+	HSZ hszService, hszTopic;				// variables for DDE server
+	uCF_HpObj = RegisterClipboardFormat(_T(CF_HPOBJ));
+	hszService = DdeCreateStringHandle(idDdeInst,szAppName,0);
+	hszTopic   = DdeCreateStringHandle(idDdeInst,szTopic,0);
+	DdeNameService(idDdeInst,hszService,NULL,DNS_REGISTER);
+
+
+	soundEnabled = soundAvailable = SoundOpen(uWaveDevId);					// open waveform-audio output device
 
     ResumeThread(hThread);					// start thread
     while (nState!=nNextState) Sleep(0);	// wait for thread initialized
diff --git a/app/src/main/cpp/win32-layer.c b/app/src/main/cpp/win32-layer.c
index 4e8cb22..6b0a978 100644
--- a/app/src/main/cpp/win32-layer.c
+++ b/app/src/main/cpp/win32-layer.c
@@ -3645,3 +3645,46 @@ int GetLocaleInfo(LCID Locale, LCTYPE LCType, LPSTR lpLCData, int cchData) {
 		return 0;
 	}
 
+
+/* DDE */
+
+DWORD DdeQueryString(DWORD idInst, HSZ hsz, LPSTR psz, DWORD cchMax, int iCodePage) {
+	//TODO
+	return 0;
+}
+
+LPBYTE DdeAccessData(HDDEDATA hData, LPDWORD pcbDataSize) {
+	//TODO
+	return 0;
+}
+
+BOOL DdeUnaccessData(HDDEDATA hData) {
+	//TODO
+	return 0;
+}
+
+HDDEDATA DdeCreateDataHandle(DWORD idInst, LPBYTE pSrc, DWORD cb, DWORD cbOff, HSZ hszItem, UINT wFmt, UINT afCmd) {
+	//TODO
+	return 0;
+}
+
+UINT DdeInitialize(LPDWORD pidInst, PFNCALLBACK pfnCallback, DWORD afCmd, DWORD ulRes) {
+	//TODO
+	return 0;
+}
+
+UINT RegisterClipboardFormat(LPCSTR lpszFormat) {
+	//TODO
+	return 0;
+}
+
+HSZ DdeCreateStringHandle(DWORD idInst, LPCSTR psz, int iCodePage) {
+	//TODO
+	return 0;
+}
+
+HDDEDATA DdeNameService(DWORD idInst, HSZ hsz1, HSZ hsz2, UINT afCmd) {
+	//TODO
+	return 0;
+}
+
diff --git a/app/src/main/cpp/win32-layer.h b/app/src/main/cpp/win32-layer.h
index 0a6b3fe..8025174 100644
--- a/app/src/main/cpp/win32-layer.h
+++ b/app/src/main/cpp/win32-layer.h
@@ -1401,3 +1401,40 @@ typedef struct addrinfo ADDRINFO;
 
 extern int closesocket(SOCKET s);
 
+/* DDE */
+
+#define DDE_FACK                0x8000
+#define DDE_FNOTPROCESSED       0x0000
+
+#define     XTYPF_NOBLOCK            0x0002
+
+#define     XCLASS_BOOL              0x1000
+#define     XCLASS_DATA              0x2000
+#define     XCLASS_FLAGS             0x4000
+
+#define     XTYP_CONNECT            (0x0060 | XCLASS_BOOL | XTYPF_NOBLOCK)
+#define     XTYP_POKE               (0x0090 | XCLASS_FLAGS         )
+#define     XTYP_REQUEST            (0x00B0 | XCLASS_DATA          )
+
+DWORD DdeQueryString(DWORD idInst, HSZ hsz, LPSTR psz, DWORD cchMax, int iCodePage);
+LPBYTE DdeAccessData(HDDEDATA hData, LPDWORD pcbDataSize);
+BOOL DdeUnaccessData(HDDEDATA hData);
+HDDEDATA DdeCreateDataHandle(DWORD idInst, LPBYTE pSrc, DWORD cb, DWORD cbOff, HSZ hszItem, UINT wFmt, UINT afCmd);
+
+typedef HDDEDATA (CALLBACK *PFNCALLBACK)(UINT wType, UINT wFmt, HCONV hConv,
+                                         HSZ hsz1, HSZ hsz2, HDDEDATA hData, ULONG_PTR dwData1, ULONG_PTR dwData2);
+#define     APPCLASS_STANDARD            0x00000000L
+
+#define     CBF_FAIL_ADVISES             0x00004000
+#define     CBF_FAIL_EXECUTES            0x00008000
+
+#define     CBF_SKIP_REGISTRATIONS       0x00080000
+#define     CBF_SKIP_UNREGISTRATIONS     0x00100000
+
+#define DNS_REGISTER        0x0001
+#define DNS_UNREGISTER      0x0002
+
+UINT DdeInitialize(LPDWORD pidInst, PFNCALLBACK pfnCallback, DWORD afCmd, DWORD ulRes);
+UINT RegisterClipboardFormat(LPCSTR lpszFormat);
+HSZ DdeCreateStringHandle(DWORD idInst, LPCSTR psz, int iCodePage);
+HDDEDATA DdeNameService(DWORD idInst, HSZ hsz1, HSZ hsz2, UINT afCmd);
diff --git a/app/src/main/java/org/emulator/calculator/Settings.java b/app/src/main/java/org/emulator/calculator/Settings.java
index e0c1e8f..fdc0e29 100644
--- a/app/src/main/java/org/emulator/calculator/Settings.java
+++ b/app/src/main/java/org/emulator/calculator/Settings.java
@@ -157,7 +157,6 @@ public class Settings extends PreferenceDataStore {
 		return json.toString();
 	}
 
-	@SuppressWarnings("unchecked")
 	private static String toJSON(Map<String, Object> map) {
 		StringBuilder json = new StringBuilder();
 		json.append("{");