Can I ask a dumb question? How do I compile & link this test? I must be doing something wrong. tst.cpp: #include <stdio.h> #include "blackbox.h" int main() { printf("Hello, "); Mike(); printf("Hello, "); Michael(); }; blackbox.h: void Mike(); void Michael(); class BlackBox { public: void Mike(); void Michael(); }; blackbox.cpp: #include <stdio.h> class BlackBox { public: void Mike() { printf("Mike\n"); }; void Michael() { printf("Michael\n"); } }; Mike Vandeman 925-901-7270 Mike Vandeman 925-901-7270