Hello All, My name is Jason Woodside. I am new to this site and new to C\C++. Thank you for having me! I am experimenting with C\C++ in particular "Blaze C" and trying to program a handheld PC. I'm receiving compile errors when using header files whose functions are wrapped in extern "C". I was told by the developer of the header files that I must define MSWIN, MSWIN32 and MSWINDLL in my environment in order to make the symbols expand correctly. Hmm. Does anyone know what that means and how I should go about actually doing that? Thank you for your support.