In a Windows application, you are responsible for
seting up and registering your window(s), menus, writing the message-handling loop and supplying window message-handling procedures (WinProcs etc). It normally is a single-thread process, but you can start other threads if you want.
QUickWin is a multithread process that sets up windows for you using the the WIndows Multiple Document Interface model (MDI) and provides a default window menu bar and a status bar. Normally, you do not have access to the message handlers (except for dialogs you set up), but you can sub-class windows and add some bespoke message handling if necessary.
