In order to add Tango DLL functionality to your Visual C++ project, you have to follow this steps:
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1) Copy "Tango.cpp", "Tango.h" and "Tango.dll" into your project's folder


2) In your "[projectname]Dlg.h", please insert: 
   
   a) #include "Tango.h"
   
   b) under "public:" or "protected:" CTango *pTango


3) In your "[projectname]Dlg.cpp" under "OnInitDialog()", please insert: 
   
   pTango = new CTango();


4) When closing your dialog, please don't forget to do some clean up in "OnClose()":

   pTango->Disconnect();
   delete pTango;


5) Now you're ready to use the DLL, simply call any DLL function like 
   
  pTango->ConnectSimple(1,"COM1",57600,false);