diff --git a/pykd/dbgdump.cpp b/pykd/dbgdump.cpp
index 3c333d7..e8c71bb 100644
--- a/pykd/dbgdump.cpp
+++ b/pykd/dbgdump.cpp
@@ -16,92 +16,76 @@ bool  dbgStarted = false;
 
 /////////////////////////////////////////////////////////////////////////////////
 
-bool
+void
 dbgLoadDump( const std::wstring &fileName )
 {
     HRESULT     hres;
     
-    try {
+    if ( dbgStarted || isWindbgExt() )
+        throw DbgException( "debugger is alread attached" );
     
-        if ( dbgStarted || isWindbgExt() )
-            return false;
+    g_dbgClient.startEventsMgr();
+   
+    hres = dbgExt->client4->OpenDumpFileWide( fileName.c_str(), NULL );
+   
+    if ( FAILED( hres ) )
+        throw DbgException( "IDebugClient4::OpenDumpFileWide failed" );
         
-        g_dbgClient.startEventsMgr();
-       
-        hres = dbgExt->client4->OpenDumpFileWide( fileName.c_str(), NULL );
-       
-        if ( FAILED( hres ) )
-            throw DbgException( "IDebugClient4::OpenDumpFileWide failed" );
-            
-        hres = dbgExt->control->WaitForEvent(DEBUG_WAIT_DEFAULT, INFINITE);
-        if ( FAILED( hres ) )
-            throw DbgException( "IDebugControl::WaitForEvent failed" );
-            
-        dbgStarted = true;            
-
-        return true;
-    }
-    catch( std::exception& )
-    {
-    }
-    catch(...)
-    {
-        dbgExt->control->Output( DEBUG_OUTPUT_ERROR, "pykd unexpected error\n" );
-    }
-
-    return false;
+    hres = dbgExt->control->WaitForEvent(DEBUG_WAIT_DEFAULT, INFINITE);
+    if ( FAILED( hres ) )
+        throw DbgException( "IDebugControl::WaitForEvent failed" );
+        
+    dbgStarted = true;            
 }
 
 ///////////////////////////////////////////////////////////////////////////////// 
 
-bool
+void
 startProcess( const std::wstring  &processName )
 {
     HRESULT     hres;
-
-    try {
         
-        if ( dbgStarted || isWindbgExt() )
-            return false;        
+    if ( dbgStarted || isWindbgExt() )
+        throw DbgException( "debugger is alread attached" );
+    
+    g_dbgClient.startEventsMgr();        
+
+    ULONG       opt;
+    hres = dbgExt->control->GetEngineOptions( &opt );
+    if ( FAILED( hres ) )
+        throw DbgException( "IDebugControl::GetEngineOptions failed" );
+
+    opt |= DEBUG_ENGOPT_INITIAL_BREAK;
+    hres = dbgExt->control->SetEngineOptions( opt );
+    if ( FAILED( hres ) )
+        throw DbgException( "IDebugControl::SetEngineOptions failed" );
+
+    std::vector< std::wstring::value_type>      cmdLine( processName.size() + 1 );
+    wcscpy_s( &cmdLine[0], cmdLine.size(), processName.c_str() );
+
+    hres = dbgExt->client4->CreateProcessWide( 0, &cmdLine[0], DEBUG_PROCESS | DETACHED_PROCESS );
+    if ( FAILED( hres ) )
+        throw DbgException( "IDebugClient4::CreateProcessWide failed" );
+
+    hres = dbgExt->control->WaitForEvent(DEBUG_WAIT_DEFAULT, INFINITE);
+    if ( FAILED( hres ) )
+        throw DbgException( "IDebugControl::WaitForEvent failed" );
         
-        g_dbgClient.startEventsMgr();        
-
-        ULONG       opt;
-        hres = dbgExt->control->GetEngineOptions( &opt );
-        if ( FAILED( hres ) )
-            throw DbgException( "IDebugControl::GetEngineOptions failed" );
-
-        opt |= DEBUG_ENGOPT_INITIAL_BREAK;
-        hres = dbgExt->control->SetEngineOptions( opt );
-        if ( FAILED( hres ) )
-            throw DbgException( "IDebugControl::SetEngineOptions failed" );
-
-        std::vector< std::wstring::value_type>      cmdLine( processName.size() + 1 );
-        wcscpy_s( &cmdLine[0], cmdLine.size(), processName.c_str() );
-
-        hres = dbgExt->client4->CreateProcessWide( 0, &cmdLine[0], DEBUG_PROCESS | DETACHED_PROCESS );
-        if ( FAILED( hres ) )
-            throw DbgException( "IDebugClient4::CreateProcessWide failed" );
-
-        hres = dbgExt->control->WaitForEvent(DEBUG_WAIT_DEFAULT, INFINITE);
-        if ( FAILED( hres ) )
-            throw DbgException( "IDebugControl::WaitForEvent failed" );
-            
-        dbgStarted = true;            
-
-        return true;
-    }
-    catch( std::exception& e )
-    {
-        dbgExt->control->Output( DEBUG_OUTPUT_ERROR, "pykd error: %s\n", e.what() );
-    }
-    catch(...)
-    {
-        dbgExt->control->Output( DEBUG_OUTPUT_ERROR, "pykd unexpected error\n" );
-    }
-
-    return false;
+    dbgStarted = true;            
 }
 
+///////////////////////////////////////////////////////////////////////////////// 
 
-///////////////////////////////////////////////////////////////////////////////// 
\ No newline at end of file
+void
+attachProcess( ULONG  processId )
+{
+    HRESULT     hres;
+    
+    hres = dbgExt->client->AttachProcess( 0, processId, 0 );
+    if ( FAILED( hres ) )
+        throw DbgException( "IDebugClient::AttachProcess failed" );
+}
+
+///////////////////////////////////////////////////////////////////////////////// 
+
+    
\ No newline at end of file
diff --git a/pykd/dbgdump.h b/pykd/dbgdump.h
index 4cc6524..b84fcce 100644
--- a/pykd/dbgdump.h
+++ b/pykd/dbgdump.h
@@ -4,10 +4,13 @@
 
 /////////////////////////////////////////////////////////////////////////////////
 
-bool
+void
 dbgLoadDump( const std::wstring &dumpName );
 
-bool
+void
 startProcess( const std::wstring  &processName );
 
+void
+attachProcess( ULONG  processId );
+
 /////////////////////////////////////////////////////////////////////////////////
diff --git a/pykd/dbgext.cpp b/pykd/dbgext.cpp
index 7a51348..d4b95bc 100644
--- a/pykd/dbgext.cpp
+++ b/pykd/dbgext.cpp
@@ -91,6 +91,8 @@ BOOST_PYTHON_MODULE( pykd )
         "Load crash dump (only for console)");
     boost::python::def( "startProcess", &startProcess,
         "Start process for debugging (only for console)"); 
+    boost::python::def( "attachProcess", &attachProcess,
+        "Attach debugger to the exsisting process" );
     boost::python::def( "dbgCommand", &dbgCommand,
         "Execute debugger command. For example: dbgCommand( \"lmvm nt\" )" );
     boost::python::def( "isValid", &isOffsetValid,