I'm very confused .. In the documentation they say: For writing applications for Series 3000 terminals: • The Microsoft Visual C++ 1.5 development system should be installed on your development PC. Note: It is important that you use the Microsoft Visual C++ Professional edition, and not just Microsoft Visual C++. The latter does not support the development of DOS applications. Further on in the documentation there are mix references to MV C++1.5 and MV C++ 1.52. I could not find any professional version of VC++1.52 . But the fact is that the executable that i compile with VC++1.52 is different from the one that they provide. It is slightly bigger and it isn’t fully functional (some parts doesn’t work). Any way , someone responded me from Symbol so maybe there is a chance. Thank you for you posts!