Create an Application without a Window

Question

How would you program a C/C++ application that could run without opening a window or console?

Answer 1

If you have a need to contiguously run your program without having console or window you might find useful deamon on *NIX or services on Windows, this .NET example if you need plain win32 just google a little bit for sample.
Since your question tagged as win32 i assume that services are more relevant for you.